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Home > SEEDS - Pasture Grass > Sunn Hemp (Soil Builder)

Sunn Hemp Seed

Sunn Hemp Soil Rebuilder & Cover CropSunn hemp seed (Crotalaria juncea L.) produces a fast growing legume that is a nitrogen fixing soil builder and cover crop for tropical and southern climates. Sunn Hemp is used in many tropical countries as the number one cover crop for reclaiming poor land. A wonder crop, it is a non-toxic fertilizer for soils that grazing wildlife such as deer simply love. Livestock such as cattle prefer the dried forage (hay) of Sunn Hemp.

This amazing crop has many advantages that cannot be overlooked
  • Matures 60 to 90 days from planting at around 6 ft tall -- this may increase under proper conditions, to a height of 10 -12 ft
  • Produces 100 lbs of nitrogen -- this may increase with favorable conditions to 200 lbs
  • Moves a minimum of 10 lbs of residual phosphorous from the subsoil to the topsoil -- this can be as high as 20 lbs
  • Moves around 80 lbs of residual potash from the subsoil to the topsoil -- under favorable conditions this may increase to 160 lbs
  • This all occurs after the plant's growth cycle and as a bonus it produces up to 4 tons of organic matter (biomass)
  • Suppresses rootknot and nematodes as well as weeds!
  • A great soil builder, increases drought tolerance and yield and cash value of the next crop
  • The leaves of Sunn Hemp contain 30% protein
  • Food plots -- Deer love the leaves; turkey and quail love the cover provided; Livestock will eat the dried leaves or 'hay'.
  • When properly planted Sunn Hemp will eliminate weeds -- an advantage for food plots and farmers alike
Note that raw Sunn Hemp seed requires an inoculant for nitrogen production -- Inoculate with the cowpea-type rhizobia bacteria.

Sunn Hemp (Soil Builder)
Code Name Image Price    
WG-SUNHEMP-50 SunHemp 50 LB. Bag - Cover Crop, Deer Food Plot & Soil Builder $129.00


Planting & Growing Sunn Hemp

There are millions of acres of Sunn Hemp grown in other countries. Brazil calls it their number one soil builder. Sunn hemp, being a tropical plant, grows only in the summer here in the USA and needs warm weather (frost-free) for 8 to 12 weeks to provide biomass and nitrogen. Sunn Hemp is much easier to get incorporated into the soil to fix nitrogen when needed than sorghum, cow peas, and many other cover crop varieties. Sunn hemp is originally from India and has been grown since the dawn of agriculture. It has been grown as a deer food plot, soil rebuilder, green manure, livestock feed for forage, hay, and for non-wood fiber.

Sun Hemp is gaining in popularity as a deer food plot crop in the Southern USA as deer love the leaves -- 30% protein -- and if plowed under after reaching maturity (flowering) it also fixes the poor soils so often found in sandy Southern USA. Turkey and quail will use Sunn Hemp for cover.


Into a well prepared weed-free seedbed, broadcast pure live seed at 4060 lb/acre (4567 kg/ha), or drill at 3050 lb/acre (3456 kg/ha) to a depth of 1⁄21 inch (1225mm) in rows 6 inches (15 cm) apart. Use higher seeding rates if the crop will be incorporated within 3045 days or if severe weed competition is expected. Where weed competition is mild, drilled rates as low as 20 pounds of live seed per acre have been satisfactory. Planting rates for food plots range from 15 lbs. with other species to 30 lbs. as a stand alone crop. Be sure and inoculate seed with a cowpea type inoculant (a Bradyrhizobium species).


Warm weather (frost-free) is needed for 8 to 12 weeks to provide biomass and nitrogen. Sunn Hemp must be plowed under before reaching the full bloom stage or it becomes too fibrous when using it as a green manure. Maximum foliage nitrogen content is highest at or before the early bloom stage. Home gardeners with light tillage equipment should incorporate when plants reach a height of 3
ft (90 cm), within 3050 days after planting.

Please be aware that just because Sunn Hemp is a member of the Crotalaria genus, some people may be concerned about the appropriateness of its use as an agricultural crop. These concerns are not warranted just because it is in the Crotalaria genus as there are 600 known species in this genus all with varying characteristics. Please see this USDA article for more information.

Seedland ships to all 50 US states + US territories of Puerto Rico, Guam & Virgin Islands.
UPS GROUND: We do NOT offer UPS Ground shipments to locations outside the 48 US mainland states.
Shipments to Puerto Rico, Guam and Virgin Islands can only ship via USPS Priority Mail (No UPS).
Shipments to Alaska and Hawaii must ship either Priority Mail or UPS Next Day or UPS 2nd Day Air.
All Ground UPS rates quoted are valid ONLY for shipment to locations in the 48 mainland US states.

DELIVERY TIME: Most items ship within 24 to 72 hours (1-3 days) and generally take 2-10 days for delivery to be completed,
depending on the item shipment location and your ship-to destination. (NOTE: No shipments delivered on weekends)
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ORDER INFORMATION: We reserve the right to cancel any orders for products or seeds in which either the items are no longer available or discontinued.  On items in which the pricing was listed incorrectly online due to an error in pricing correctly, we will contact you with the corrected price. For our retail customers we will offer you the wholesale price for that particular item, however pricing errors will NOT be honored at the incorrect "error" price. Any product that displays a zero price ("$0.00") is considered to be out of stock item. Usually the product will also be marked as SOLD OUT, however in some cases only a zero price may display. Customers will be notified the actual normal price on zero price items once the item becomes available. Out of stock (SOLD OUT) items will not be billed, backordered or shipped unless you specifically contact us requesting an order be shipped when available - You will be notified of the item price on any out of stock item that you request to be shipped later. You may call and request that an out of stock item be shipped as soon as it returns to stock availability. All sales are not completed or accepted until payment has been completed, at that point shipment of product orders will occur.

For added security, we do NOT immediately process credit card orders live online.  Your order is first reviewed by a sales specialist for any changes, questions or corrections. After review, your order is then processed securely and items are scheduled for shipment. For additional company information and policies visit - Seedland can only assist with commercial quantities for shipments of seeds outside the USA, please read our export policy link above. Note that we do NOT ship or export fertilizers, spreaders or other manufactured merchandise outside the US states. For returns please review our return policy listed at the link above. Most items ship within 24 to 72 hours (1-3 days) and generally take 2-10 days for delivery depending on item shipment location and your location. We can not guarantee immediate same day shipment on expedited items but will try and ship these requests as quickly as possible. Live plants and grass plugs do NOT immediately ship after your order is processed. See our shipment policy on these items.

SHIPPING NOTE: We ship most online orders VIA UPS Ground (United Parcel Service) for economical & fast service. Items often ship from multiple locations (Florida, Georgia, Arizona, Colorado, Illinois and Oregon / Depending on item ordered) Most UPS orders ship and arrive in 1-7 working days (Mon-Fri). See additional information below for shipments to Hawaii, Puerto Rico, Guam and USVI. In some cases an additional handling charge may be included in the total cost of the shipping charges listed for your order.

IMPORTANT SHIPPING DETAILS: We can NOT guarantee SAME DAY shipment of Priority Mail, UPS Next Day, UPS Second Day or UPS 3 Day shipments. We will make every attempt to ship the same day your order is placed (If placed prior to 3 PM EST Mon-Fri), but we can NOT guarantee immediate same day shipment. Note that UPS does NOT deliver on Saturday with the methods of shipment we offer. Priority mail items usually ship 1-2 working days AFTER the day your order is placed. All shipments and processing of orders are based on working days (Monday - Friday). UPS & MAIL shipping charges include a packaging and handling fee in the total shipping cost. Seedland's UPS Ground shipping cost is same price for shipping to any of the USA 48 mainland states. Shipping is based on total weight of items shipped at same time in any one order.

PENKOTED SEEDS: Click information about Penkoted Seeds for information about Penkoted seeds.