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Balansa Clover

Quick to establish and early to bloom, Viper provides early nutrients and feed for both soil and animal health. Ideal for pollinators too!

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Variety Summary

Viper balansa clover is an early maturing, high-yielding annual legume able to tolerate a wide range of soils. It produces significant amounts of nitrogen, ideal for cover crops and animal feed. Viper may be cut for stored forage or grazed. It is highly digestible, and adapted to rotational grazing. Viper can also take close grazing, even when young. Abundant flowers attract pollinators while hard seed production provides natural reseeding. Early trial results indicate Viper also has moderately good winter hardiness.*


Tremendous Tolerance

Viper balansa performs well in an extremely wide range of soils, tolerating pH levels from 4.5-8.3 and able to survive in waterlogged soils and short periods of flooding.

Grows Like No Other

Viper is quick to germinate, with better vigor/earlier growth than some other balansa varieties. Initially, Viper forms a small, multi-branched rosette emerging from a single, deep taproot. Under a grazing regime, Viper will remain prostrate. However, allowed to grow, Viper’s stems will eventually turn upright, forming a multi-branched hollow stem with copious amounts of plant mass up to three feet high.

As the plant matures, it will continue to grow and produce blossoms that are very attractive to pollinators. Allowed to seed, Viper is capable of producing large amounts of regenerative hard seed viable up to three years.

Viper balansa clover


Cover Crop

Viper’s nitrogen production, soil-building root structure, and extensive biomass production make it a top choice for adding to a cover crop mix. Viper can be combined with grasses, brassicas and other legumes. Balansas have been shown to fix over 100 lbs. N/acre per year. Viper, in particular provides that N earlier, due to its earlier maturity.


Viper can be frost seed or broadcast into existing pastures to boost protein levels of forage, while contributing nitrogen to other crops. With excellent digestibility and protein levels in the upper 20’s, Viper is an ideal component in a small grain/grass/legume sward that can be harvested by grazing, hay or silage. Viper can take close grazing, even when young. Use with other non-legumes will reduce bloat potential.


Viper produces abundant flowers. Honeybees and other pollinators love it and so do the deer!

Trial Data

*Winter Hardiness

Early trial results indicate Viper also has moderately good winter hardiness.Viper has been tested in the United States since 2017. While we have much to learn about it, so far, Viper has shown moderately good winter survivability in PA, OH, & IN, along with early growth and vigor.

Early Flowering

In both the South and the North, we have seen Viper demonstrate abundant growth, early flowering and extensive pollinator activity.

More To Come

As part of our continued research efforts, Viper was planted at numerous locations in 2019, with new data anticipated by fall of 2020.

Planting Information

All cool-season clovers, including Viper, need time to establish before harsh weather arrives. In the lower Southern USA, the best time to plant is late fall. In the upper South, plant mid-late fall or early spring. In the North, plant early fall or early spring. Frost seeding also works well. If planting during other times, reseeding may be necessary to achieve an optimal stand. Viper may winterkill in areas with harsh, open winters.

Viper needs to be inoculated with Rhizobium leguminosarum biovar trifolii. This is best achieved with Nitro-Coat®.

Seeding Rate – Pure stand5-8 lbs/ac
Seeding Rate – Mix with grasses3-5 lbs/ac
Seeding Rate - Established grass pasture3-4 lbs/ac
Planting Zones (map)green
Planting Dates - Southlate fall
Planting Dates - Upper Southmid-late fall or early spring
Planting Dates - Northearly fall or early spring
Planting Depth1/8" - 1/4"
Planting MethodPrepared/firm seedbed by broadcast or drill. Cultipacking or dragging before and after helps create a firm seedbed.
Optimal pH Range4.5 - 8.3
Map of the united states showing where Viper can be grown