White and Ladino Clover for forage systems
White clover (Trifolium repens L.) is a long-lived, stoloniferous perennial legume that spreads by creeping stems (stolons) that root at the nodes. Individual crown stems are relatively short-lived, often dying within one to two years, but the plant persists through continual stolon growth and rooting. This growth habit allows white clover to tolerate close grazing and recover rapidly when managed properly.
Types of white clover
White clovers used in U.S. forage systems are commonly grouped into three size classes:
- Small (wild-type) white clover – Often naturalized and persistent under low fertility and continuous grazing, but typically low yielding.
- Intermediate white clover – Includes common or Dutch white clover types widely sold commercially. These balance persistence and productivity and are common in mixed pastures.
- Large white clover (ladino types) – High-yielding, large-leaved cultivars selected primarily for forage use.
Despite differences in leaf size and yield potential, these groups are botanically the same species and are difficult to distinguish visually once established. Purchasing certified seed remains the most reliable way to ensure varietal purity and avoid contamination with low-yielding wild types.
Adaptation and soil requirements
White and ladino clover are well adapted to a wide range of pasture environments but perform best when basic soil fertility needs are met.
- Soil pH: More tolerant of acidic soils than red clover or alfalfa, but optimum productivity occurs at pH 5.8–6.5.
- Fertility: Adequate phosphorus (P) and potassium (K) are essential for establishment, nitrogen fixation, and long-term persistence.
- Moisture: White clover thrives under cool, moist conditions and grows best between 50 and 85°F. Because of its shallow root system, it is poorly adapted to shallow or drought-prone soils but responds very well to irrigation or consistent rainfall.
Forage value and livestock performance
Ladino clover is widely regarded as one of the highest-quality pasture legumes available:
- High crude protein and exceptional digestibility
- Low fiber concentration, making it particularly valuable for young or growing livestock
- Highly effective biological nitrogen fixer, potentially contributing 100–200 lb N/acre/year to companion grasses
Research trials, including long-term grazing studies in the Midwest, consistently show that, while reducing input costs and improving soil health grass–ladino clover pastures can match or exceed carrying capacity of grass-only pastures fertilized with 80–100 lb N/acre.
Ladino clover has historically been popular in hog and small ruminant systems and remains well suited for rotational grazing with cattle when managed correctly.
Grazing management and persistence
Grazing management is the single most important factor influencing ladino clover persistence and its proportion in a pasture.
- Frequent, moderate grazing favors white clover by reducing grass competition.
- Long rest periods or undergrazing allow grasses to dominate and outcompete clover.
- A uniform grass-clover mixture, with clover making up no more than 30-40% of the stand, balances productivity, persistence, and animal health.
Ladino clover is relatively tolerant of close defoliation and is less prone to winter injury from fall grazing than red clover or alfalfa.
Bloat and animal health considerations
Bloat remains the primary concern limiting wider use of ladino clover. While many producers graze ladino for years without incident, others have experienced serious losses.
Key management practices to reduce risk include:
- Maintain a mixed grass-clover stand rather than pure clover
- Avoid turning hungry cattle onto lush clover pastures
- Delay grazing when pastures are wet with dew or rain
- Use rotational rather than continuous stocking
There are no truly non-bloating white or ladino clover varieties, despite occasional claims to the contrary.
Establishment and overseeding
White and ladino clover are well suited for frost seeding or overseeding into established grass pastures, especially tall fescue.
- Successful stands have been established by overseeding 1 lb/acre for two consecutive winters without tillage.
- Winter seeding (January-February) allows freeze-thaw cycles to incorporate seed naturally.
- Nitrogen fertilizer should be avoided during establishment to reduce grass competition.
Recommended seeding rates (PLS basis)
- Mixed with other legumes: ~0.25 lb/acre
- Single legume with grass: 0.5-1.0 lb/acre
- Overseeding existing grass pasture: 1-2 lb/acre
White clover seed is very small, with over 800,000 seeds per pound, making precise calibration essential.
Seed quality and certification
Certified white or ladino clover seed typically meets or exceeds:
- ≥99% purity
- ≥85% total germination (including hard seed)
- Approximately 84% pure live seed (PLS)
All recommended seeding rates assume seed quality equal to or better than certified standards.
White or ladino clover summary
White and ladino clover remain cornerstone legumes for resilient, low-input pasture systems. When soil fertility is adequate and grazing is managed intentionally, ladino clover can dramatically improve forage quality, animal performance, nitrogen cycling, and pasture productivity, while reducing reliance on purchased nitrogen fertilizer.
Sweet clover in forage and soil improvement systems
Sweet clover (Melilotus spp.<.em>) is one of the most resilient and soil-building legumes available to producers, valued less for consistent high-quality hay and more for its ability to thrive under harsh conditions while delivering exceptional nitrogen fixation and soil improvement. Both annual and biennial types exist, but in the central United States the biennial sweet clovers are by far the most important for forage and conservation use.
Types and varieties
Sweet clovers are broadly grouped by flower color and life cycle:
- White blossom sweet clover (Melilotus alba)
Includes named varieties such as Denta and Polara, though most seed marketed today is commercial common. - Yellow blossom sweet clover (Melilotus officinalis)
Generally finer-stemmed, slightly higher in forage quality, but lower yielding than white types. Yellow sweet clover typically matures 10 days to two weeks earlier, making it useful where early spring forage or drought tolerance is important. Varieties such as Madrid, Goldtop, and Yukon have been used historically, with Madrid noted for drought tolerance. - Annual sweet clovers
Used primarily as winter annuals in southern systems or short-season cover crops. Hubam and Israel are examples, though annual types are less common in forage systems today.
Adaptation and soil requirements
Sweet clover has one of the widest ranges of adaptation of any forage legume, with one critical limitation: soil pH.
- Soil pH: Requires pH 6.0 or higher for proper nodulation and growth; lime is essential. Sweet clover also has a relatively high calcium requirement.
- Fertility: Remarkably efficient at accessing less-available soil phosphorus and can produce acceptable yields on soils where alfalfa, red clover, or ladino clover fail. While it tolerates low fertility, maximum production still requires moderate nutrient availability.
- Moisture and temperature: Exceptionally tolerant of drought, heat, and dryland conditions, often outperforming alfalfa under moisture stress. Yellow types are generally more drought-hardy than white.
- Soils: Grows well on claypan, loam, and sandy soils and shows surprising tolerance to periodic wet conditions.
Sweet clover is also relatively resistant to grasshopper damage compared to many other legumes.
Plant growth and life cycle
Biennial sweet clover completes its life cycle over two growing seasons:
- Seeding year: Establishes a deep taproot and crown buds but typically does not flower. Grazing or mowing below 10-12 inches during late summer is highly detrimental because it damages buds needed for second-year growth.
- Second year: Produces rapid, upright spring growth from dormant buds on the lower stem. Unlike alfalfa, regrowth does not come from the crown. Cutting or grazing too low will kill the plant.
- Once flowering begins, sweet clover quickly sets seed and dies, making timing and grazing pressure critical during the second year.
Forage value and animal performance
Sweet clover is less palatable than most legumes due to its coumarin content, but livestock typically adapt quickly and graze it readily. When managed properly:
- Animal performance is comparable to alfalfa during the spring and early summer of the second year’s growth.
- For a short window, carrying capacity may exceed that of alfalfa, making it one of the more productive short-term pasture legumes available.
- Bloat risk is lower than alfalfa or red clover, though not zero. Sweet clover is generally not well suited for hay, due to stemminess and risks associated with improper curing.
Coumarin and livestock health
Sweet clover naturally contains coumarin, which is harmless in pasture but can be converted to dicumarol when mold develops in hay or silage. Dicumarol is an anticoagulant that can cause internal bleeding.
Risk management strategies include:
- Avoid feeding moldy sweet clover hay or silage
- If questionable hay must be used, feed small amounts for short periods of time, followed by feeding periods using non-sweet clover forage
- Good curing and storage practices virtually eliminate risk
Uses in forage and cropping systems
Pasture use
Sweet clover excels as a short-rotation pasture legume:
- Provides limited grazing in the seeding year, depending on companion crop competition
- Can be grazed once plants reach 12-14 inches, but should not be grazed in September-early October while root reserves are forming
- Requires high stocking rates in the second year to delay flowering while avoiding overly close grazing
Soil improvement and nitrogen fixation
As a soil-building crop, sweet clover is nearly unmatched:
- Deep taproot improves soil structure and alleviates compaction
- Produces large biomass that decomposes rapidly
- Fixes exceptionally high amounts of nitrogen
In classic Midwest trials, sweet clover produced over 140 lb N/acre by the end of the seeding year, far exceeding alfalfa, red clover, or white clover. Spring-seeded stands can be plowed down in fall or winter with minimal loss of nitrogen benefit.
Pollinator value
Both yellow and white sweet clover are excellent nectar and pollen sources for honeybees. Yellow types typically bloom earlier, and using both extends the flowering period.
Establishment and cultural practices
- Best seeding time: Late winter or early spring
- Late summer/fall seeding: Often shortens the life cycle and can reduce total production by up to 30%
- Common establishment method: Frost seeding or overseeding into small grains
- Seeding rate: ~8 lb/acre of scarified seed (PLS basis)
- Grass mixtures: Sweet clover performs best with a cool-season grass; for example:
- 8 lb PLS sweet clover + 8-10 lb PLS tall fescue per acre
Sweet clover seed contains a high proportion of hard seed, allowing it to persist and volunteer for many years. The same rhizobia inoculant used for alfalfa is appropriate for sweet clover.
Pests and diseases
Sweet clover is generally disease tolerant but highly susceptible to the sweet clover weevil, which can destroy new seedings in high-pressure areas. Second-year stands are usually damaged but rarely killed.
- Insecticides remain the primary control option
- Weevil pressure is a major reason sweet clover use has declined in some regions
Key takeaways
- Sweet clover is one of the best legumes for nitrogen fixation and soil improvement
- Requires high soil pH, but tolerates low fertility better than most legumes
- Extremely tolerant of drought, heat, and insects
- Best suited for short-term pastures and soil-building rotations
- Management must avoid close grazing during critical growth stages
- Susceptible to sweet clover weevil and not ideal for hay production