Seeds! That essential element of prairie restoration, seeds are hand gathered and then planted by stewards, volunteers, and crew over hundreds of acres at Nachusa Grasslands each year. Gathering seeds by hand assures that only the right, ready, and wanted species are collected. But there is another method of seed harvesting and planting utilized at Nachusa: mechanized, with combine and broadcast seeders. 

With a combine, very large areas of seeds can be gathered in a very short time. In 2016, the Nachusa crew hand collected about 4000 lbs. of seed, while combining yielded about 20,000 lbs. Combining is not as precise a method as hand gathering and will retrieve the seeds of everything in its path, including weeds. This is minimized by carefully monitoring the path of the combine and either driving around an area of unwanted seeds or by disengaging the combine head.

The photo above shows a field which yielded a variety of seeds: Big and Little Bluestem; Indian Grass; Smooth, Sky Blue, and Silky Asters; Old Field, Missouri, and Showy Goldenrod; Rough Blazing Star; Round–headed Bush Clover; and Pale Purple Coneflower, among others. The advantage of this method, in addition to large-scale collecting, is that it frees the crew to concentrate on rare, harder to collect seeds, such as from those plants that are too low to the ground to gather by combining.

Combines can operate with different types of heads (front part of combine) for harvesting various grains and seeds. Nachusa's combine uses a rice-stripping head. The metal "fingers" (photo above) spin very fast, stripping seeds off each stem. This is much more efficient and collects less chaff compared to using a soybean head, which cuts and harvests the stems along with the seeds. The combine has also been further modified: the fans have been turned off and the top of the stripping head has been covered with a wire screen to minimize the loss of the fine, fluffy seeds.

Because the special head brings in very little chaff, the seeds can be directly planted without going through the hammermill. 

After drying, the seed collected by combining is mostly given to conservation partners of Nachusa Grasslands, such as Byron Forest Preserve, Natural Land Institute, and Franklin Creek State Natural Area.  Some of the seed is used to supplement the seed hand gathered by stewards and crew.  Some of the seed is used to plant areas that were recently cleared of brush. 

This 103-acre field is much too large an area to plant by hand. The crew fills antique broadcast seeders with a mixture of the combine-gathered seed and hand-gathered seed. The broadcast seeders, attached to the back of trucks, are then driven over the field, again and again, spreading the seed.

There are many factors that filter into a successful restoration. Weather, of course, is one factor. Often, after an initial planting, there are places where growth is sparse. Overseeding is done, sometimes over several years, to help increase growth and also to add more diverse plants. Diligent weeding is also done to eradicate unwanted and invasive species. New plantings are often burned on a yearly basis for a few years to help with weed control and encourage native species growth. Nachusa's staff and volunteers have gone through this process of collecting and planting prairies over 120 times within the past 30 years. After many years of  care and hard work, a beautifully restored prairie may bloom. 

This blog was written by Charles Larry, volunteer and photographer at Nachusa. To see more of his images, see:  charleslarryphotography.zenfolio.com  

Nachusa volunteers and stewards collect 125+ seed species for both new and field–overseed plantings. Seed collection begins at Nachusa around mid–May and continues through the first week of November. This year 100 new acres will be planted to prairie and about a dozen stewards will overseed 150 acres or more on various newer restorations.
 
How much seed is needed to plant 100 acres to prairie this fall?

Native plant species do not all grow together in one spot, so the first challenge is to know where to find them on the 4,000 acre preserve. The next task is to decide when the seeds are ready to harvest, for there is only a short window of time to gather each species. Stewards and staff will consult one another to determine the optimal time a species is ready to pick because the exact seed maturation can vary from year to year. Now, be amazed, because much of the seed has been hand–picked!

​When found, not all seed is ready to pick, so when hand–picking, only the ripe seed is chosen. The rest of the seed is left on the plant to mature and is usually revisited when ready.

​Once seeds are collected, they are dried on racks or placed in large barrels where dry air is circulated throughout. After a seed species is dried, it is milled with a hammermill to ensure seeds are freed from the chaff. Each seed species along with the chaff are stored so it can be easily divided and later added to different mixes at ratios required for specific plantings. 
​

Countless hours of collecting and planting over the past 30 years has resulted in a rich and diverse grassland, supporting creatures both great and small.

Join Nachusa volunteers and bring in the final seeds for the season! For more information, visit the Saturday Workday page on the website.

​Today’s author is Dee Hudson, a photographer and volunteer for Nachusa Grasslands. To see more prairie images, visit her website at www.deehudsonphotography.com. ​​