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Quick summer cover crop: Cowpeas and buckwheat

Cowpea and buckwheat cover cropI've read that cowpeas and buckwheat combined at one part cowpeas to two parts buckwheat make a quick summer cover crop that works well with no-till gardens.  My trials (so far) agree.

Last year, I tried out buckwheat as our summer cover crop, and wasn't all that thrilled, but I think that part of my disappointment was not understanding what I should be expecting.  Like other summer cover crops that fit between the harvest of your spring crops and the planting of your fall crops, buckwheat isn't going to add as much organic matter to your soil as the more woody winter cover crops will.  Instead, buckwheat soaks up nitrogen that might otherwise get leached out of bare ground, keeping the nutrient in circulation for your next crop, and the buckwheat stems and leaves also break down quickly after being killed so that you don't need to let your beds rest long before planting.  Depending on your climate, you can slip buckwheat into a four to six week gap in your garden year, cutting it anywhere from when the flowers first appear until one week after full bloom, and then waiting one to two weeks before planting into the tiny bit of stubble that remains.

Cutting cover crop


Adding cowpeas to the buckwheat cover crop reduces your need to add a layer of compost before seeding your fall garden since you greatly increase the amount of available nitrogen produced.  Like many legumes, cowpeas fix nitrogen out of the air,  and they do that even better when there's very little nitrogen in the soil for them to suck up.  Buckwheat steals soil nitrogen from its neighbors, tricking the cowpeas into fixing more nitrogen than they would if grown by themselves in the same soil.  You cut the duo at the same time you would have cut the buckwheat (which is several weeks earlier than you would normally cut cowpeas) and end up with somewhere between 50% to 100% of your nitrogen needs for the fall garden taken care of.

Pollinator on buckwheatOf course, cover crops have other purposes besides adding nutrients and organic matter to the soil.  They slow down weed growth, prevent erosion, and (in the case of buckwheat) attract masses of beneficial insects.  The only potential downside is if you have trouble killing them, but the weedeater seems to have done a good job of demolishing nearly all of the buckwheat and cowpeas with one pass.  They're so easy to pull up that I won't mind at all hand-weeding the few plants left behind.

Our chicken waterer is always POOP-free.


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Since this is my first year running REAL garden, I didn't know thing one about cover crops. Just ordered my seeds, and we'll be in good shape for next year.
Comment by Cat Sun Jul 31 17:48:14 2011
You shouldn't feel bad --- I think of cover crops as advanced gardening. I only started learning about them during our fourth growing season and this second year I'm still experimenting. Once you figure out the ones that work for your area and growing system,though, they're an extremely useful tool to have in your gardening arsenal.
Comment by anna Sun Jul 31 17:59:56 2011
have you found or created a nice gardening calendar that includes when to plant cover crops?
Comment by david L Mon Aug 1 10:00:07 2011

That's an excellent question, and I wish I had an excellent answer. (If you do find a better answer, I hope you'll comment with a link!)

I've been getting my cover crop information from a very good free pdf document that you can download here: http://www.sare.org/Learning-Center/Books/Managing-Cover-Crops-Profitably-3rd-Edition. (The print copy costs money, but if you scroll down, you can download the file for free.)

I've discovered that only a few cover crops work well with my no-till garden here in zone 6, and here are the planting dates I've developed for them. (You would tweak these if you live in a different zone.)

Buckwheat --- plant anytime between last frost and one month before first frost

Cowpeas --- plant between last frost and two months before first frost (or one month before first frost if you're mixing with buckwheat.)

Oats --- Plant August 1 through September 15 for a fall and winter cover that will be a mulch in spring.

Oilseed radish --- Plant August 1 through September 7 for a fall and winter cover that will disappear in mid spring.

Comment by anna Mon Aug 1 14:11:32 2011

Is it a good idea to plant a cover crop after EVERY production crop? or can you get by with just a winter cover ,IE, non-producing times.

Comment by david L Tue Aug 2 09:57:20 2011

You can use anywhere from no cover crops at all to whole fallow years with one cover crop after another to really rejuvenate the soil. How much of your garden area/time you want to devote to cover crops will probably depend on whether you've got good, loamy soil (in which case just adding compost every year will keep your levels of organic matter stable, or you might choose to slip in cover crops here and there) or soil that's badly in need of renovation.

Our growing area has highly variable soil conditions in different parts. In the worst zone, I'm planting one vegetable crop per year and then running one or two cover crops to try to build up the soil. That area has terrible drainage, so I'm especially focusing on oilseed radishes to break up the subsoil.

Another area has well-drained soil, but is primarily clay that's low in organic matter. It's my sunniest spot, so I focus on growing spring and fall crops there (and tomatoes) and slip my cover crops between the two in the summer. Sometimes I have beds that I won't be planting for the fall garden, in which case I plant oats to give the soil an extra heavy duty dose of organic matter.

My last area has the best soil but is too shady for anything except summer growing. I plant oats there to keep the soil well mulched over the long winter while also building biomass. If I happen to have a bare spot in the summer, I'll also toss in a summer cover crop, but I don't focus on them.

In general, think of cover crops as replacing part of your compost and/or mulch (depending on their C:N.) They add organic matter and keep the ground from being bare. I think it would probably be possible to keep a no-till garden going with no compost and mulch inputs if you grew enough cover crops, but that might mean using two or three times the growing area!

Comment by anna Tue Aug 2 11:17:53 2011
The bees also benefit from the buckwheat. The small, white flowers are a favourite with them, providing a much needed source of nectar during a time when there usually aren't that many other plants flowering. The honey is a deep, rich brown and as aromatic as the flowers themselves. Definitely one of my favourites, too.
Comment by John Tue Aug 9 18:41:56 2011
We do see our honeybees on the buckwheat, but the native pollinators seem to be even more abundant. They're so displeased when I cut down their nectar source that I try to do it early in the day before the insects get too active!
Comment by anna Tue Aug 9 18:59:17 2011

I am ready to try this! When you say one partcow peas two parts buckwheat - how do you measure that?
I'm thinking of braodcasting and then raking in about 1/2 cup of buckwheat seeds over a 40 sq ft row from which I just harvested potatoes. Then pushing in cowpeas - about one every sq ft? Does this make sense?

Comment by Jan Sat Jul 11 16:11:45 2015
Jan --- I'm talking parts by volume. Your method could work well too. I'll be curious to hear how your mixture fares!
Comment by anna Sun Jul 12 20:53:24 2015

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