Ben explains garlic mustard identification before we headed out to the trail.
Garlic mustard is originally from Europe and was brought to North America in the 1800s for cultivation as a garden herb. It escaped cultivation and spread through natural areas across the US. It is detrimental to natural areas due to its lack of natural predators, early growing season, and ability to produce up to 3,000 seeds per plant. It also releases a chemical that inhibits the growth of nearby native plants that provide food and habitat for native wildlife. Together, these traits allow this aggressive plant to quickly take over many areas, including intact woodlands. Check out the before and after pictures below!
Garlic mustard patch before we pulled it out.
The same spot after volunteers removed the garlic mustard. Much better!
You can control garlic mustard effectively by hand pulling the second year flowering plants before they set seed, taking care to remove as much of the root as possible. So if you see it in your yard, help out your native Michigan plants and wildlife by pulling it out!
This post was written by our Land Stewardship crew. We’re lucky to have a great team again this year that is excited about natural areas management in our parks. Look for weekly posts from them through the summer, in addition to the posts from Cam Mannino!
Meet the Oakland Township Parks and Recreation Stewardship Crew! Now that the field season has begun, we’d like to introduce two of the new Land Stewardship Technicians who will be working hard all summer to restore the natural areas of the township park system (the third technician will be starting soon!). The Stewardship Crew will be working on prescribed burns, invasive species removal, and native seed collecting and planting. They also spend time monitoring vernal pools, bird nest boxes, changes in vegetation, and lake water quality.
New to our crew this year are Marisa (left) and Alex (center). Marisa is a sophomore at Grand Valley State University studying Natural Resources Management. Alex is a graduate from Michigan State University, and is currently focusing on gaining experience in land and wildlife management. Alyssa (right) is our Stewardship Specialist who has been with us since April 2018. Grant will be joining our crew soon, so check back soon to learn about him.
Stay tuned for weekly posts on what the crew is up to. If you see us in the parks, make sure to stop and say hi!
Spring is an incredibly busy time for our stewardship manager, Dr. Ben VanderWeide. So many projects demand attention at once – and they all depend on so many variables! Planting native seed has to happen while the ground is still cold and wet. Prescribed burns, however, have to happen when the wind is low and from the right direction, and the plants are dry.
Meanwhile volunteer training and supervision is going on for vernal pool monitoring, nesting box monitoring and burn crews. Whew! Here’s a sample of what went on in late March and April at just one location – Bear Creek Nature Park.
Seeding Mowed Areas with Native Seed
In late March, Dr. Ben and Stewardship Specialist Alyssa Radzwion began a project to spread the seeds of native grasses and wildflowers in the areas cleared by forestry mowing last fall. The hope is that these native plants can help prevent some renewed growth of the invasive shrubs that were removed. It’s a project that will take years of persistent work, but they made a good beginning.
Monitoring the Life in Vernal Pools
In mid- April, the stewardship staff, a stewardship tech from the Six Rivers Land Conservancy (see Ian below) and a group of volunteers, including Parks Commissioner Dan Simon and his wife pulled on tall boots and waders and ventured into the vernal pools in Bear Creek’s forest. The purpose is to monitor the health of these temporary pools, which are biodiversity hotspots in our forests.
As usual, the crew found a surprising variety of creatures. Spring frogs, salamanders and many insects choose vernal pools as a good place to mate and lay eggs because they are free of hungry fish. The pools dry up and disappear in warmer weather, preventing fish from establishing if they are introduced.
Nest Box Monitoring
For the second year, Dr. Ben has organized and trained a group of volunteers to monitor nest boxes from first nesting to the flight of fledglings. We “citizen scientists” report our data to Cornell Ornithology Lab’s “NestWatch” program. This year Ben added six boxes in Bear Creek Nature Park to the ones in Draper Twin Lake Park, Charles Ilsley Park, and along the Paint Creek Trail. And I’ll be the Bear Creek monitor this year, which will be great! I’m hoping to count Eastern Bluebirds and Tree Swallows, and possibly Black-capped Chickadees or House Wrens where the nest boxes are closer to trees and shrubs. We might have Brown-headed Cowbirds to count too if those characters lay their eggs in any of the other birds’ nests!
The boxes were only up a day or so when Tree Swallows (Tachycineta bicolor) and Eastern Bluebirds (Sialia sialis) began to explore the boxes. I’m betting they are impressed with the real estate – new construction, a southeast exposure and a security system (metal predator guards to keep out raccoons, snakes, etc.). Between raindrops last Thursday, I watched a pair of Tree Swallows courting on one of the new boxes. They were doing their wet gurgling call to each other the whole time and touching beak-to-beak, while the male performed fancy wing displays. The male had just chased off a competitor, so he seemed excited! It looks like an argument in the photo below, doesn’t it? But I think it was just a lively prelude to mating.
I also found two completed Bluebird nests made of dry grasses in the new Bear Creek nest boxes, but didn’t get to see the female doing the building. However, here’s a little Bluebird female I saw at Charles Ilsley Park the week before bringing nesting material to her box.
Much to my delight, four days later at Bear Creek Nature Park, I found the first egg in one of our new boxes – a Bluebird egg. They lay one egg each day for 3-5 days and won’t start incubating them until all the eggs are laid. The eggs then generally hatch on the same day, making feeding the nestlings more efficient for the adult birds. Remember, please, that only trained and certified volunteers are allowed to monitor the bluebird boxes so as not to cause too much disturbance at the nest!
Holding Prescribed Burns Using Trained Volunteers
The township uses prescribed burns to periodically refresh our fire-adapted native plants, which benefit from periodic fires. Some of these burns are complicated and require hiring professional burn crews. But many are conducted by a group of volunteers trained and supervised by Dr. Ben. In late April, previous volunteer crew members and some new volunteers practiced their skills with two small burns at Bear Creek Nature Park in the native gardens near the parking lot. Volunteers are an important part of the stewardship program and the teamwork is an great way to meet local people who care about the natural world. Consider joining us!
And a Celebratory Dance to End a Busy Month
Toward the very end of April, Dr. Ben arranged our annual Earth Day/Spring celebration: The Woodcock Dance Watch – and wow! This year’s dance was spectacular! This odd bird, with big eyes toward the back of its head, a stout body and a huge beak, does its unique aerial mating dance at dusk.After a short review of information about the American Woodcock (Scolopax minor), we toasted marshmallows while waiting for the sun to set. (Thanks to iNaturalist photographer Ty Smith for sharing his photo.)
This year, one of our birding group members had been making almost nightly visits to Bear Creek Nature Park to watch one particular Woodcock who faithfully danced on the path near a certain puddle. So, as the sky darkened, ten of us gathered on the slope designated by our birder friend, Vinnie, and waited.
Suddenly, very close to us, the Woodcock landed on the path and started his dance. He began with a very odd bug-like buzz called a “peent” call while turning in circles, as he attempted to attract any available female. Then he took to the air with whirring wings, flying in lazy circles high in the air while burbling a different call. Finally he plopped back down right where he started. Without pause he started the “peenting” again, and the dance continued. It was an exciting performance! We all came away feeling it had been an evening well spent celebrating the spring rituals of the natural world.
A Busy Month for Nature and its Stewards
Ah, Spring! Little creatures slip into and out of ponds to begin mating. Seeds await the moisture and warmth they need to thrust new stems into the sunlight. Birds are busy migrating north, establishing territory, finding mates, building nests – even dancing! And we humans are busy studying, recording and preparing their habitat for another glorious summer!
If you enjoy fly fishing, kayaking, or weekends on the water Up North, you won’t want to miss this opportunity to get hands-on training about New Zealand mud snails (NZMS). This new aquatic invasive species has been spreading rapidly through high-quality trout streams in northern Michigan, and we want to prevent it from getting into the beautiful streams in southeast Michigan, like our Paint Creek.
The workshop will be at the Paint Creek Cider Mill, 4480 Orion Road, Rochester, MI 48306 this Wednesday, April 17 from 6 to 8 pm. Learn about New Zealand mud snail biology, fishing gear decontamination, and detecting them using a rapid assessment and eDNA sampling. Hope to see you there!
In March, I spent two glorious days at the 32nd annual convention of the Wildflower Association of Michigan. Having worked with Ben VanderWeide, our township’s Natural Areas Stewardship Manager for four years, I’m still absorbing information on native plants at a ferocious pace.
Like many of us, I’d never given much thought to the sources of plants surrounding my house. The lovely family that built our house no doubt thought of landscaping and gardening more as a decorative exercise than as a crucial way to establish beautiful and healthy habitat for insects, birds, and other wildlife. As a result, the small woods on one side of our property is full of non-native plants, shrubs and trees which do little or nothing to create habitat that supports wildlife. Luckily, the other side was left largely in native trees and our small slice of field carries an assortment of prairie plants and grasses.
Dr. Doug Tallamy, author of Bringing Nature Home: How You can Sustain Wildlife with Native Plants, gave the keynote at this sold-out conference. He shared the science behind native plants in a completely engaging and easily understandable presentation. Dr. Tallamy and the other presenters opened my mind and put a hopeful smile on my face. Can our lawns and gardens really make a difference in preserving the natural world? Their answer was an emphatic “Yes!” And I’m already envisioning a transformation outside my front door!
Why Bother with Native Plants, Anyway?
Dr. Tallamy began by pointing out that it isn’t really a matter of native vs. non-native. Plants from other parts of the world aren’t “bad,” but as Lois B. Robbins, author of Lawn Wars, puts it “A plant that is well-behaved in its hometown will often lose its inhibitions in another locale and trash the place.” Alien plants can be aggressive in a new environment, crowding out native plants since the restraints present in their native lands are not there to stop them. They can require more watering and fertilizing because they aren’t used to foreign soil. And as you’ll see below, they are not able to feed most of our wildlife. The value of native plants is that they are perfectly suited to their habitat; they have evolved over millions of years to survive in their home environment.
As I discussed in an earlier blog, plants pass along the sun’s energy (and the earth’s nutrients and water) to all the creatures around them, humans included. Some are eaten both by us and by the other creatures in our local habitat. And some in each generation successfully reproduce, providing food for a next generation. But for that process to continue functioning, we specifically need… brace yourself… more insects!
Is It Possible to Be Welcoming to Insects???
We’ve all grown up in a world where insects are referred to as “pests” and routinely swatted, sprayed with deadly chemicals or fried in “bug zappers.” But the famous biologist E.O.Wilson calls them “The Little Things that Run the World.” Why? We first think of them as important for pollination, and they are. They pollinate 80% of all plants and 90% of all flowering plants. Without insects, most plants can’t reproduce.
But there’s more to insects than pollination. Insects form the next ring out from plants in nature’s food web. They eat plants and when eaten themselves, they pass along the sun’s energy to fish, amphibians, reptiles, and of course, birds. According to Dr. Tallamy, insects and spiders “are essential dietary components for 96 percent of North American terrestrial bird species.” They eat them all year, even in winter, seeking out frozen or hibernating insects (or their eggs and larvae) for the protein they need to stay warm. They also need insects in order to raise their young in the spring and summer.
Insect caterpillars are birds’ favorite food for offspring. Caterpillars, the larval stage of insects, pass along the most energy from plants to other animals. Bird feed them to their nestlings because they’re soft for tiny throats. Plus, they’re loaded with both fat and protein for little birds, and caterpillars are large. One fat caterpillar is easier for an adult bird to pluck up and ferry back to the nest than gathering up and delivering hundreds of tiny aphids, for instance. By the way, insects are 25% of a Red Fox’s diet and 23% of a bear’s. So mammals (including in many cultures, humans!) eat them as well.
So, How Does the Importance of Insects Relate to Native Plants?
It turns out that insects vastly prefer the plants with which they evolved. In fact, research shows that 90% of insects are specialists; they will only eat or lay their eggs on certain native plants. The Monarch Butterfly (Danaus plexippus) is, of course, an extreme example. Out of the 2,137 genera of plants in North America, the Monarch’s caterpillar can eat exactly one – the milkweeds (genus Asclepias).
The very reason butterflies and hundreds of thousands of birds go to the trouble of migrating north is the huge pulse of food produced each spring by our native plants and the insects that feed on them. Butterflies and other insects may lay their eggs on non-native leaves and stems if that’s all that is available, but once the caterpillars hatch, they often can’t eat them or can’t get enough nutrition to finish developing into reproductive adults. With fewer caterpillars, 90% of birds have less to eat – and on it goes throughout the food web.
Dr. Tallamy compared native trees and non-native trees on his property and at the Holden Arboretum in Kirtland, Ohio where he does his research. He marked out areas of native and non-native plants and recorded the number of caterpillars found on them over a set period of time. Here are results:
Native Oak – 419 caterpillars from 19 species
Native Wild Cherry – 239 caterpillars from 14 species
Non-native and invasive Callery/Bradford Pear – 1 caterpillar (a common tree in subdivisions and office parks)
Non-native Burning Bush – 4 caterpillars from 1 species
Dr. Tallamy shared the results of a study on CarolinaChickadees (Poecile carolinensis), which need 6,000 to 9,000 caterpillars in a season to rear one clutch of fledglings! His student, Desirée Narango, compared chickadee breeding success in home landscapes with native plants vs. landscapes filled with non-natives.
The results were pretty dismal for lawns like mine. Non-native areas, like most of my current yard (and maybe yours):
produced 75% fewer caterpillars
were 65% less likely to have breeding chickadees
the nests contained 1.5 fewer eggs
the nestlings were 29% less likely to survive (not enough food!)
nests produced 1.2 fewer fledglings
the maturation of nestlings was slower by 1.5 days
Have a look at Just a few of the many species I’ve seen on one of our common native wildflower, Bee Balm (Monarda fistulosa). (Use pause button for captions.)
Have a look in your yard this summer. At the end of the summer, if I bother to look, I’ll find many more signs of insect munching on the big, leafy Black Oaks (Quercus velutina) in our front yard, for instance, than I will on our non-native Japanese Maples (Acer palmatum) or invasive Black Locust trees (Robinia pseudoacacia).
“No holes, no chewed leaves, no damage – sounds good to me!” you might be thinking. After all, that’s one reason that you and I have always liked non-native species and why nurseries like to sell them! If you want plants that are just decorative, that might work for you, but not for the nature around you. But step back a few paces and the chewed leaves of natives are hardly noticeable. I’m hoping my yard can be beautiful while also being more productive, filled with life and energy, more a working part of the natural world.
Some Questions You Might Be Asking Yourself
Dr. Tallamy respectfully described some of the questions and challenges other scientists have raised about native plants and their importance. Here’s what his research and the research of others have shown that answered their concerns and maybe yours.
But I’ve seen birds and butterflies feeding on non-native plants! Ten percent of insects are generalists who can eat a wide variety of plants, but even their populations are lower on non-native plants than on natives. Adult butterflies and other native insects can often sip nectar or spread pollen from non-native flowers, thereby helping them take over fields! But unfortunately their caterpillars cannot grow to adults by eating non-native plants. As a result, insects in landscapes with few native plants don’t reproduce effectively, their numbers decline, and the loss is felt throughout the food web.
Birds will also feed on non-native plants, but they often can’t get the nutrition they need. For example, our native plants produce berries in the summer that have low fat and high sugar content, which is great for fledgling birds. In the fall, native berries are high in protein which is just what migrating birds and birds that spend the winter require. Non-native berries in the fall and winter are very low in fat and high in sugar, which won’t sustain birds on migration or in cold weather.
Isn’t this just some romantic notion about returning to an imagined pre-European settlement, pristine world – or even worse, a kind of horticultural prejudice against alien plants? Again, the issue isn’t good plants or bad plants. If we want to restore habitat, we need plants that feed our local food web, that provide insects for food, and that provide shelter and nest sites for birds and other local wildlife. Native plants are just much more efficient and productive at doing that than non-native plants.
When does a non-native plant become native? How long does it have to be here?If non-natives acted in the food web like natives, we wouldn’t care how long it had been here. But they just don’t, because insects don’t adapt to new foods quickly. The invasive, non-native grass Phragmites (Phragmites australissubspecies australis) feeds 170 plant-eating insects in its native Europe. But it’s been in North America for 300 years and only feeds 5 insect species here. Eucalyptus trees (genus Eucalyptus) feed 48 species in their native Australia. They’ve been in North America for a 100 years and feed only one!
How about planting cultivars of native trees bred for special colors or flowers, for example? In general, when nursery-developed cultivars of native trees are planted, caterpillar abundance drops 65%. Bees too are very particular about flower shape. When native flowers or trees are bred for double flowers instead of single ones, it can have a big impact on pollinators. Or if the leaf color is changed to red or purple instead of green, insect numbers drop. Changing to variegated leaves, changing height or berry size, however, may not be a problem.
Aren’t There Still Plenty of Native Insects in Wild Areas if Not Our Yards? Well, no, in fact, there aren’t. Here in the Midwest, 50% of our native bees have disappeared from their historic ranges in the last century. Four bumblebee species declined 96% in the last 20 years. 25% of our bumblebees are already at risk for extinction. 50% of our mid- western native bee species have disappeared in the last 100 years. Globally, there’s been a 45% decline in insects since 1975 – almost half of the insects in the world gone in about 45 years! Germany has experienced a 79% decrease in insects! (On the bright side, Amsterdam has seen a 45% increase in bee populations since developing a policy of using native plants throughout the city.)
Many natural areas in our region (and yours too, probably) are heavily infested with aggressive non-native plants just like the woods on my property. That’s why our township stewardship program is always working to eliminate aggressive non-native plants and restore abandoned fields and forests to a healthy, diverse assortment of native plants. Many non-native plants have historically been promoted by nurseries and landscapers and then escaped into the wild. The seed of others arrived here in livestock feed or grazing grasses.
Some of you older readers may remember moths dancing in the headlights when your parents drove the car at night. Some people affixed bug screens to the fronts of cars to prevent insects from smashing regularly into the grill, hood or windshield. But no more. Unfortunately, every generation thinks the number of insects around them is “normal” when it’s actually been steadily declining for decades.
Major Causes of Insect Decline
We usually think of insecticides first when we hear about the decline in bee, butterfly or other insect populations – and they do have a powerful effect. And climate change is no doubt taking a toll as well.
But the fact is that we just don’t have enough natural areas full of native plants left on our planet to feed insects and hence other wildlife. Researchers estimate that half of the arable land on earth is now covered by agriculture or ranching. Corn and soy bean seeds, the most common agricultural plants in America these days, are often treated with insecticides which are designed to kill some insects. These plants are also wind-pollinated and so don’t provide nectar or pollen for insects.We have 770 million acres of rangeland in the US, an area 12 times larger than the state of Michigan! Ranchers are just now being encouraged to integrate native grasses after decades of growing largely non-native grasses. And our non-native lawns are actually the largest irrigated “crop” in the United States.
Commercial areas are built on former grasslands and prairies, then covered with asphalt. The Denver airport alone, for example, covers an area the size of Manhattan in asphalt. We have built housing in field after field, forest after forest and covered millions of miles in roads. That’s where we home owners come in…
Property Owners Can Now Play a Crucial Role in Restoring Natural Habitat
Non-native plants hold the upper hand in most natural areas that are not managed carefully. Luckily, our township’s stewardship program here is restoring native habitat in our parks every day. Former farm fields choked with non-native shrubs and plants are being restored to diverse and beautiful prairies like the one above, full of the color and insect hum of native plant communities. And we can do the same on a smaller scale right out our front doors.
Property owners – home owners, businesses or towns – are now our best hope for restoring native habitat for the benefit of wildlife and ultimately for ourselves as well. Currently, our yards are largely “green deserts” in the sense that they just don’t provide enough food, protection or nesting sites to support the food web and create healthy habitat for wildlife. At most American homes, like mine, the lawn is a stretch of non-native turf grass (the standard lawn grasses) and the gardens are still largely filled with non-native trees, bushes and flowers.
So what do you think? Can we declare a ceasefire with more of our insects? After all, only about 1% of all insects are even interested in us – and proper clothing, screens, and repellent can keep most of them at bay. Can we begin to add beautiful native plants to our non-native gardens, gradually turning them into beautiful habitats that flutter and hum with life? Perhaps some of us will even be adventurous enough to replace our sod carpets with a well-maintained variety of native grasses or interesting green sedges. Perhaps we can ask more companies and towns to install native plant landscapes. I’m so hopeful that we’ll see a new garden ethic, a renaissance of native plants, come to fruition in my lifetime. The visionary conservationist John Muir made the best case for preserving our native habitats:
“When one tugs at a single thing in nature, he finds it attached to the rest of the world.”
Suggestions and Resources for Introducing Native Plants to Your Yard and/or Garden
Get a copy of Bringing Nature Home by Douglas W. Tallamy. The whole book is great. Chapters 8-12 are specifically targeted toward getting started with native plants in your lawn or garden.
Look for native plants sales in your community. This year the Oakland Township Parks and Recreation Commission sponsored a sale, for instance (orders are already in for this year). I’m aware also of yearly native plants sales in our area: North Oakland Headwaters Land Conservancy hosts a sale in Clarkston, and Cranbrook sells plants rescued from developments. If you look, you’ll find some near you if you live further afield.
The best native plant sources provide genotypes from your state or local area. Here is a lists of plant suppliers in southern Michigan that we know. (Let us know if we missed any!)
Hidden Savanna Nursery near Kalamazoo grows Michigan native wildflowers, grasses, shrubs and trees sold in containers and plugs. Specializing in Southwest Michigan genotypes. They have several retail sale dates on weekends in spring and late summer.
Wildtype in Mason, Michigan. Largely a wholesaler but have three weekends in May and one in August for those of us buying retail and in smaller quantities. The retail catalog has helpful information about each plant.
Michigan Wildflower Farm near Portland, MI grows Michigan native wildflower and grass seed, and provides design, consultation, installation, and management.
Native Connections near Three Rivers, MI grows Michigan genotype wildflower and grass seed, design, consultation, installation, and management.
Go Grow Plant Natives near Charlotte, MI is a native plant nursery specializing in Michigan native shrubs, trees, and wildflowers.
Designs By Nature, LLC. near Laingsburg, MI. A native plant nursery and native landscape consulting company. 517.230.2923, email@example.com
The Native Plant Nursery in Ann Arbor grows only local native plant species from Michigan seed sources and produces a diverse selection of native perennials and a few species of native trees and shrubs. Often has a booth at the Ann Arbor farmer’s market.
She Is Growing Wild in Ada, MI grows and sells over 80 Michigan native species. 616.450.7407, firstname.lastname@example.org.
DISCLAIMER: Oakland Township Parks & Recreation does not endorse or promote any business entity which produces or markets native plants or seeds, or which provides landscape design or installation services. The list of vendors is provided for informational purposes only. Information above is from the websites of the Michigan Native Plant Producers Association, River City WildOnes, and the Native Plant Guild. Links to websites included when available, otherwise phone numbers and email addresses.
Beware of buying any plants or seeds treated with insecticides, specifically neonicitinoids, as they are harmful to insects despite what the label says about it being approved for human health. Also avoid seed mixes that say something very general like “prairie seeds.” You may get a glorious bloom the first year, but many of the plants are not local and could introduce invasive plants that you and your neighbors will battle later on.
Get comfortable with bees and other pollinators as well as insects and their valuable caterpillars on your property. Dr. Tallamy made 400 of us laugh when he suggested “a ten step process. Step back 10 steps and you won’t notice the caterpillars!”
Many native plants don’t need or like fertilizers or other soil amendments. Some do better without them. Some will take off too enthusiastically and try to take over your garden. Learn a bit ahead of time about which ones re-seed avidly and which tend to stay put. Be prepared to pull some out if they get too rambunctious.
Start small and consider the neighbors. Native gardens can function as an advertisement to your neighborhood of the benefits of native gardening. Keep the edges trimmed or even decoratively fenced for a tidy look. Plant informally or formally; native plants need communities of other plants, but that can include massing colors and other popular approaches to garden design.
Create mowed paths through your yard if you decide to try a native lawn, which is a larger undertaking. You want a native lawn to look tended and purposeful, not neglected.
Be patient. Remember that native prairie plants here in Michigan, for example, need deep roots to handle drought. It can take up to 3 years for your new plants to reach full bloom. Learn which plants work in your soil ahead of time but also be prepared to switch things out that don’t work, if necessary.