In October we’ve been collecting native plant seed in our parks. After all the work of growing, flowering, and making seed, plants have one more task for the year: dispersing the seed. Fluffy seeds ride the wind, buoyant seeds float on water, tasty seeds ride in the guts of animals, and “sticker” seeds cling to animal fur (or your favorite pair of socks!). And a few seeds ride in the paper bags of industrious humans! So it’s all hands on deck to collect seed during harvest time!
We collect native seeds to continue our natural areas restoration work throughout the parks. In 2019 we spread quite a bit of seed at Charles Ilsley Park, Stony Creek Ravine Nature Park, and Bear Creek Nature Park in areas where we had removed invasive shrubs. The competition from native plants helps prevent non-native species from coming back. We also spread native plant seed after controlled burns to help increase plant diversity in an area.
We try to remove only about one-third of the available seed for any of our target species. We want to leave enough seed to maintain healthy populations of native plants, while also providing food for birds and other wildlife. If the area is large enough we collect from many different plants to ensure that our seed has lots of genetic diversity.
We collect seed on a small scale, so we mostly harvest by hand. For some plants we simply snip the dried inflorescence from the plant, collecting the entire seed head. This method works best for species that are very tough and difficult to remove by hand (Black-eyed Susan), and for plants with seed that might shake off easily (asters). We also strip seed from the stem by hand. We use this method for many grasses when the seeds are mature and easy to remove from the stem. We place the collected seed in paper bags so that it can dry without molding or rotting.
After the seed dries we clean it so that it is easier to mix and spread. We remove the seeds from the seed heads, pods, or other “fruits,” and winnow out any excess plant material. We only need the seed clean enough to combine with other species in seed mixes. We aren’t too worried about some extra leaves, stems, and other chaff. Our end product is a nice bag of seed packaged in plastic bag to keep extra moisture out.
We are almost finished collecting seed for the season since most of the plants have dispersed their seeds. Keep an eye out for next year’s fall newsletter to see which days we will be collecting seed in 2020. If you are interested in helping us this year, we have a seed cleaning work day on December 3, 2019 from 12:30 – 3:30 pm at Watershed Ridge Park (1720 W. Buell Rd). If you have any questions about this work day or any questions about seed collecting don’t hesitate to ask!