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Tips for Evaluating a First Year Native Grass and Forb Planting

September 30, 2020
comparison_yr1yr2

This planting was full of "weeds" in year 1, but by year 2 planted wildflowers were abundant on the site.

Got Nature? Blog: In a previous job, I helped landowners enroll in and implement private land conservation programs like the Conservation Reserve Program. Much of my job centered around talking with landowners about how to establish and manage native grass and forb (wildflower) plantings for wildlife. Even in my job today, I provide educational opportunities including seminars, field days, and workshops centered on this topic.

One of the most common emails, phone calls, and questions I get when talking about establishing these plantings revolves around evaluating the planting during the first year.

Typically, the inquires go like this “I planted native grasses and wildflowers for wildlife this spring, and now I just have a field of weeds! Did the planting fail?” or “Nothing I planted this spring is growing!”

Following these flustered phone calls and frantic emails, I usually do a site visit with the landowner to help them evaluate their planting. Below are the four things I look for when evaluating a new native grass and wildflower planting.

Before we get into the things I look for during an evaluation, it’s important to note that native grass and wildflower plantings for wildlife typically take 2-3 years to establish. So, what you see in year one, may not be what you get in year two, three, or four. But, there are a few signs you can use to monitor your planting’s progress.

1. Weed pressure
Inevitably when you plant these diverse mixes of native grasses and wildflowers you will get weeds. Even if you control weeds before planting (which you should), some weeds will still show up, especially annual weeds like foxtail, ragweed, and horseweed. In the past, we used herbicides like imazapic (Plateau) to help control weeds during the first growing season after planting – which is still an option in native grass only stands or with certain wildflowers. But, with more diverse plantings we do not have any herbicide options to control weeds without harming what we planted. Therefore, weeds may be more of an issue in diverse plantings like pollinator plantings.

Controlling these weeds may require mowing during the growing season before they produce seed, which can help planting success. But this mowing can come at a cost. Many of these weeds like common ragweed, provide cover and food for wildlife. Mowing the field may temporarily reduce its value to many wildlife species. When evaluating weed pressure, we need to decide if weeds are dense or thick enough to reduce the germination and growth of what we planted. Generally, if the weed pressure in the field is high and it is shading out the ground, you should think about mowing to control weeds. If weed pressure is not high and sunlight is still reaching the ground, you may want to consider skipping or delaying the mowing until later in the summer.

2. Look for rows or drill marks
If you plant the field with a no-till drill, you may see rows of plants appear during the first growing season. This is a sure indication that what you planted has germinated and is growing. However, if you frost seeded the field by broadcasting the seed on top of the ground, you will not see rows. Sometimes the rows of plants will not be obvious at first, but will be very obvious later on.

3. Identify indicator plants
One the best ways I could calm the nerves of a landowner who thought they had a failed planting was by identifying species of wildflowers or grasses that they did indeed plant. Some of the annual or biennial wildflowers such as black-eyed susan or partridge pea will germinate quickly and may even flower during the first growing season. Learning how to identify some of the species you planted will help you determine if what you planted is indeed germinating and growing.

4. Scout for invasives
Another topic of discussion on a site visit is invasive plants. It is important to catch invasive early in a planting so they do not cause problems later on. Some of the common invasive plants that show up early in the life of native grass and wildflower planting are Canada thistle, sericea lespedeza, and johnsongrass. Control of these species often requires herbicide. Catching them early when they can be spot-sprayed will save you time, money, and headaches.

Looking for these four signs when evaluating your newly established planting can help you determine if it’s on the right track and help you keep it there. But, many of the species you planted are perennials, and will not be very obvious the first growing season. They are putting most of their energy towards below ground (roots), not above ground (stems) growth. So, if you don’t see them during the first growing season, it doesn’t mean they are not there. Establishing a native grass and wildflower planting for wildlife takes a bit of patience and persistence.

Video: Tips for Evaluating a First Year Native Grass and Forb Planting expands even further regarding the tips on how to evaluate your first-year planting.

Resources
Purdue Extension Pond and Wildlife Management Website
Renovating Native Warm-Season Grass Stands for Wildlife: A Land Manager’s Guide, The Education Store, Purdue Extension resource center
Native Warm-Season Grasses: Identification, Establishment, and Management for Wildlife and Forage Production in the Mid-South, The Education Store
Calibrating a No-Till Drill for Conservation Plantings and Wildlife Food Plots, Video, The Education Store
Habitat Help LIVE Q&A – Native Grasses and Forbs for Wildlife, Video, Purdue Extension – Forestry and Natural Resources Youtube channel

Jarred Brooke, Wildlife Extension Specialist
Purdue Department of Forestry and Natural Resources

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