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Little River Cooperative

Sunn Hemp - 1 pound bag cover crop

Regular price $8.00 USD
Regular price Sale price $8.00 USD
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Sunn Hemp Cover Crop
Crotolaria Juncea

Summer is the perfect time to focus your attention on building new garden space and building up soil fertility. To complete the cycle of soil care and gardening year round you may want to consider planting a cover crop in your garden this summer. Cover crops are varieties of crops that are planted during your non-production season (winter in the north, summer down here) as the part of your crop rotation where your soil can rest and be rejuvenated. Cover crops are planted primarily to manage soil erosion, soil fertility, soil quality, water, weeds, pests, diseases, biodiversity and wildlife in an agroecosystem, and can also be used to produce food, feed, or fiber or nectar for pollinators. Each region has different cover crops that are popular based on weather and climate, our most common cover crop is Sunn Hemp. 

Sunn hemp is a leguminous cover crop, so it adds nitrogen to the soil via its root system and once tilled in, all other parts of the plant, flower, stem and leaf will also be useful accessible nitrogen for your next planting. Nematodes do not use sunn hemp as a host, so planting your garden with it can help starve them out of your soil. Also, having something planted in your raised bed in the summer will provide a few complimentary benefits for your soil. We always say that "nature hates bare soil" and if you think about it its pretty true; prairies are covered in perennial grasses, forest floors are strewn with decomposing leaves, and languishing construction sites soon end up covered in "weeds" and natives being brought in by birds and the wind. If left bare your garden will be subject to erosion from extreme rainfall and nature will eventually cover it with weeds for you. Also, the complex web of soil life that you've been nurturing and tending to in your garden with your homemade compost and organic fertilizer all need roots to use as a home and a food source, and so without homes those microbes, worms, and other life forms will likely die, leaving you with less alive and undernourished soil come fall. 

To use sunn hemp cover crop properly
broadcast seeds densely, water daily for about 10 days while they germinate and establish themselves, and then cut it all down at about 60 days, before flowering. Letting the sunn hemp get too mature will leave you with thick fibrous stalks that can be hard to manage (sometimes even our commercial grade mower has a hard time with the stalk of a mature sunn hemp plant) and those stalks will decompose once cut down much slower. Theres a helpful video of us cutting down and smothering a sunn hemp crop here on our IGTV. Once the sunn hemp is cut down we like to cover it with some garden soil and hay so we can sequester its nitrogen before it dries out on the surface. 

Our 1 pound bag of sunn hemp comes with a bit of legume innoculant sprinkled in so that you can use it right away and make sure to get nitrogen nodules in your roots, and a one pound bed is a good amount to cover one 4x8 foot raised bed. 



All of our plants are produced using OMRI certified organic materials (potting mix, fertilizer & pesticides) however our nursery is not certified organic. Plants are shipped in compostable peat moss pots and we use heirloom & organic seeds whenever possible.

Shipping & Returns

We ship plant orders every Monday. Due to the nature of shipping plants we only offer expedited shipping for our live plant orders. Our returns & exchanges policy is also quite strict since its hard to control the quality of a plant once it leaves our facility, however we do our very best to make sure that each and every customer is satisfied with their plants. Read more about our policies here. 


All of our plants are potted in 4" pots and their foliage size varies based on how large the plant is naturally when its root ball is the correct size for the pot. If a plant is too tall for our shipping box we may prune it to fit (bonus: many plants do better after being pruned since they make bushier growth). We do our very best to ship all of our plants in the "sweet spot" of maturity however so long as the roots have colonized the pot we will consider a plant mature enough to ship.

Care Instructions

When you receive your plant its critical to get it out of its box and into the light the day it arrives. It will also want to be removed from its compostable plastic wrapping and given fresh water to drink. Keep in mind, this plant was grown in the tropical humid climate of South Florida, so if it's terribly cold or dry where you are it'll need to be hardened off before planting outdoors. Visit our care instructions page for more thorough info about caring for your new plant friend.

  • What Our Customers Have to Say:

    This is a great, local organization with really knowledgeable & friendly staff. They make gardening easy and accessible, and I've purchased many high quality plants and equipment from them.
    -Kate Black (5 star google review)

  • And Another One:

    How lucky we are to have a resource like Little River Cooperative here in Miami, not only for the access they offer to a great selection of plants and produce, but also for the knowledge they provide and the sense of community they foster!
    -Nick Vagnoni (5 star google review)