Trifolium michelianum L.

Balansa Clover field flowering - PastureGenetics
Soil Improvement (Green manure)

Winter-active annual clover, originated from Asia Minor (modern Turkey). Alternative to white and subterranean clovers in poor soil drainage and drought conditions. Versatile forage crop that typically does not cause bloat in grazing systems and can be used for hay, silage, or green manure with its high N-fixing capacity in both rainfed and irrigated conditions. Excellent ability to suppress weeds when sown as a cover crop. While it is relatively a new forage crop in the US, it is extensively grown in Australia as a forage and N source in ley farming systems.

Identification Characteristics

Growth Season: 
Identification Characteristics: 

Inflorescence is a cylindrical or conical flower head 1-2 1/2 inches (2-3 cm) long containing many small white-pink florets. Erect growth habit typically up to three feet (~1 m) in height, although its glabrous and hollow stems can reach more than 12 feet (3.7 m) in length. Fine, trifoliolate leaves can have smooth or serrated edges, with varying shaped leaflets.  Taproot and numerous fibrous roots extend 30-35 inches (75-90 cm) deep. Seeds range in color from yellow to red-brown and black. Produces large amount of small seeds (0.8–1.2 mg/seed) with up to 98% hard-seededness.

Growth Habit and Stand Life

Erect growth habit, typically three feet (~1 m), but stems can reach 8 feet (2.4 m) in height. Annual.

Life Cycle: 
Winter annual

Yield Potential and Production Profile

Sown in the late summer or autumn, it is winter active, with peak growth in late spring and early summer prior to flowering.

Establishment: Not strongly competitive, best sown as a monoculture or with a non-competitive plant such as plantain. Useful addition to orchardgrass-subclover pastures for adding to total legume content. Weed control necessary if sown as a monoculture for hay. Can be broadcast with fertilizer in low rainfall areas (300 mm) where open ground allows it to establish with little competition.

Inoculate with Group CS (alternatively, B or C) rhizobia if not grown before. Use 5 lb/acre (5.6 kg/ha) pure live seed if drilled ¼-1/2 inch (0.6-1.3 cm) deep and if broadcast 8 lb/acre (9 kg/ha). For mixtures, use 3 lb/acre if drilled and 5 lb/acre if broadcast (3.4 and 5.6 kg/ha, respectively).

Harvesting: Balansa clover can be used for grazing or haying. It is more suited to rotational grazing than continuous stocking and can persist long-term in pastures, provided that stock are removed during the flowering period. It can tolerate heavy, close grazing in early spring but the seed production will be greatly reduced if the stand is closely grazed during mid-late flowering. Seed harvest does not require specialized harvest machinery.


‘FIXatioN’, developed in Oregon, USA is reported to be the most cold-tolerant annual clover. Early-flowering cultivars (e.g. ‘Frontier’ and ‘Enduro’) can be grown in drier regions that receive ~ 14 inches (350 mm) annual rainfall. Late flowering ‘Bolta’ and ‘Viper’ are suited to higher rainfall areas [24 inches (~600 mm)]. For regions that receive moderate annual rainfall [20 inches (500 mm)], mid-flowering cultivars ‘Paradana’ and ‘Taipan’ are recommended.

Climate and Soil Suitability Zones

Climate Tolerances: 

Winter annual adapted to Mediterranean (summer-dry) climate but it is more tolerant of cold winter temperatures than crimson clover [to -14 °F (-26 °C) USDA Plant Hardiness Zone 5b]. Heat tolerance to July mean maximum temperatures of 79-82 °F (26-28 °C). It can be grown successfully in the Pacific Northwest and California. Early-flowering varieties can be grown in drier areas (14 inches, ~350 mm, annual rainfall). Once established, it produces more biomass at lower temperatures than most other clovers.

Soil Tolerances: 

Grows well on a range of soils type and conditions. Tolerates strongly acid to moderately alkaline (pH 5.0-8.6) and mildly saline soils (3-5 dS/m). It can grow on high clay soils to sandy soils, and tolerates water-logged soils and brief periods of flooding.

Quantitative Tolerances: 


Suitability Class

Jan Min (°C)*

July Max


Annual Precip (mm)**

Soil pH***

Soil Drainage 

Soil Salinity (dS/m)#








Moderately suited







Marginally suited







*Low temperature: USDA Plant Hardiness Zones: 5b-9b

   Rooting: taproot to 3 feet (90 cm).

*** Soil pH: Strongly Acid to Moderately Alkaline: 5.0-8.6. 

† Soil drainage: Tolerates water-logged soils. Soil drainage class abbreviations: 1=VPD, very poorly drained; 2=PD, poorly drained; 3=SPD, somewhat poorly drained; 4=MWD, moderately well drained, 5=WD, well drained; 6=SED, somewhat excessively drained; 7=ED, excessively drained. Percent relative yield for balansa clover for the classes 1-7: 15, 40, 75, 100, 100, 55, 20, respectively.

# Soil salinity: Mildly saline soils (3-5 dS/m)



Quality and Antiquality Factors

Quality Factors: 

Highly nutritious forage with high crude protein and digestibility (25% and 15% CP and 80% and 65% DDM in early and late spring, respectively).

Anti-quality Factors: 

No known antiquality component.

Species Selection Characteristics

Annual Precipitation (inches): 
12 to 16
16 to 20
20 to 24
Plant Hardiness Zones (cold tolerance): 
Heat Zone (July Mean Max Temperature): 
71 to 74 °F
74 to 77 °F
77 to 80 °F
80 to 84 °F
Soil pH Tolerance: 
Strongly acid, 5.1–7.3
Moderately acid, 5.6–7.3
Moderately acid to moderately alkaline, 5.6–8.4
Slightly acid to moderately alkaline, 6.1–8.4
Near neutral, 6.1–7.3
Soil Drainage Tolerance: 
poorly drained
Flooding Tolerance: 
3-6 days
Soil Salinity Tolerance: 
Moderately tolerant, 3–6 dS/m

Management Level Required

Suitable Management Level: 

Image Gallery



Ballard, R.A., A.D. Craig, and N. Charman. 2002. Nodulation and growth of pasture legumes with naturalised soil rhizobia. 2. Balansa clover (Trifolium michelianum Savi). Australian J. Exp. Agric. 42(7): 939-944.

Brown, H.E., D.J. Moot, R.J. Lucas, and M. Smith. 2006. Sub clover, cocksfoot and lucerne combine to improve dryland stock production. In: Proceed. New Zealand Grassland Assoc. 68: 109-115.

Monks, D.P., D.J. Moot, M.C. Smith, and R.J. Lucas. 2008. Grazing management for regeneration of balansa clover in a cocksfoot pasture. In: Proceed. New Zealand Grassland Assoc. 70: 233-238.

Ross, S.M., J.R. King, R.C. Izaurralde, and J.T. O'Donovan. 2001. Weed suppression by seven clover species. Agron. J. 93(4): 820-827.