What is a cover crop mix?
A cover crop mix is a blend of two or more species grown to protect and feed the soil between cash crops or in unused areas. Common groups include grasses, legumes, brassicas and broadleaf flowering plants, each with different strengths.
Single-species covers are simpler, and they are often a good place to start. Mixes can offer more benefits at once, but they take more planning.
Seed cost, local availability and seeding method all affect what you can grow. Start with a simple blend of two or three species and add more as you gain experience.
- Grasses make fibrous roots and plenty of residue
- Legumes work with soil bacteria to supply nitrogen
- Brassicas have deep roots that loosen soil
- Flowering plants can feed pollinators
Why does diversity help?
Different plants root at different depths and feed different soil organisms. A mix can protect soil in several ways at once, from holding it in place to suppressing weeds to feeding soil life.
Research results vary, and a mix does not always outperform a single species. The best mix is the one that fits your goal, your climate and your management, which is why local advice is worth seeking.
Mixes can also bring in pollinators and beneficial insects when they flower. If you are planting flowering covers, think about when you plan to end them, so you do not remove them while insects are using them.
How do I choose species for my goal?
Start with the problem. If erosion is the concern, you want quick ground cover. If you want to add nitrogen, include legumes. If you want weed suppression, choose fast, dense growers. If compaction is a problem, ask about deep-rooted species.
Check what grows well in your frost dates and soil. Cover crop planting time is tied to your first and last frost, not to a calendar date, so ask your extension office for local advice and seed sources.
Soil temperature and moisture at seeding time matter as much as the calendar. A warm, moist seedbed gets a cover crop growing quickly, and a dry one may leave patchy stands.
What can go wrong with mixes?
Mixes can be tricky to manage. One species may crowd out the others, seed may be costly, and some species may set seed and turn into weeds if not managed on time. Some covers also host pests or diseases that affect following crops.
Know how you will end the cover crop before you plant. Mowing, rolling, grazing, tarping and tillage are common methods, and each has its own timing and effect on the next crop.
Ending a cover crop at the wrong stage can cause trouble. Grasses that go to seed can become weeds, and thick residue can tie up nitrogen or slow soil warming. Ask local advisors about timing for the species you choose.
- One species crowding out the rest
- Seed that sets and becomes a weed
- Residue that slows soil warming
- Cover that hosts pests for the next crop
How do covers fit with animals and gardens?
Some covers can be grazed, but grazing rules and safety vary. Some species can be harmful to certain animals at certain stages, so check with your veterinarian or extension office before turning animals onto a cover crop.
In a garden, covers can go in beds that are empty in the off season. Allow time for residue to break down before planting small seeds, and watch for slugs that like the cover.
Check cover crop rules if you are in a cost-share or organic program. Seed type, planting date and termination method can all affect eligibility.
How do I try this on my farm?
Start with one area and one simple mix, and record planting date, weather, growth and how you ended it. Compare the following crop with a nearby area that had no cover.
Ask your local NRCS office and extension office about cost-share programs that may support cover crops. Programs differ by area and by year, and they have their own rules.
Keep a simple map of what you planted where, because this helps you notice patterns from year to year.
- Record planting date and weather
- Record how and when you ended it
- Compare with an area that had no cover
Key takeaways
- Mixing species can serve several goals at once, but it takes planning.
- Choose species by the problem you want to solve and your frost dates.
- Plan how you will end the cover crop before you plant it.
- Check with your veterinarian before grazing animals on any cover crop.
Sources and further reading
Last reviewed: November 12, 2026. Written by the Homestead & Small Farm Editorial Team. See our editorial policy.