Many types of plants have the potential to become a reliable source of livestock feed, but few match the flexibility and practicality of cowpea. Before committing to planting cowpea as a forage crop, it pays to understand what kind of plant you are working with. The growth habit, variety type, and physical characteristics of cowpea directly affect how it should be cultivated, when to harvest, and how it performs as feed for cattle and other livestock.
This guide covers the plant characteristics of cowpea, the main variety types, and how to choose the right one based on your farm’s goals, whether that is grazing, silage making, hay, or dual-purpose grain and forage production.
contents
- 1 What Kind of Plant Is Cowpea?
- 2 Cowpea Plant Characteristics
- 3 The Four Main Cowpea Growth Habits
- 4 Choosing the Right Cowpea Type for Your Farm Purpose
- 5 Why Cowpea Is Good for Cattle: Key Facts
- 6 No Part of the Cowpea Plant Goes to Waste
- 7 Frequently Asked Questions about Cowpea Plant Types and Forage Use
What Kind of Plant Is Cowpea?
Cowpea (Vigna unguiculata L. Walp.) is a warm-season annual herbaceous legume from the genus Vigna, family Fabaceae. It is one of the oldest cultivated crops in the world, domesticated in Africa thousands of years ago and now grown across tropical and subtropical regions of Asia, the Americas, and Australia.
Unlike grasses, cowpea is a true legume. This means it forms a symbiotic relationship with rhizobium bacteria in the soil to fix atmospheric nitrogen through root nodules. This single characteristic makes cowpea highly valuable not just as feed, but as a soil-building crop that improves land fertility with every growing cycle.
Cowpea is diploid with 22 chromosomes and a relatively compact genome. Depending on the variety and growing conditions, maturity can range from 50 to 160 days. This wide range is part of what makes cowpea so adaptable. Early-maturing varieties, sometimes called the “hungry-season crop,” are ready before cereal crops and help fill feed gaps during the growing season.
Cowpea Plant Characteristics
Understanding the physical structure of the cowpea plant helps farmers make better decisions about planting density, harvesting timing, and feed preparation.
| Plant Feature | Description |
|---|---|
| Plant height | 50 to 100 cm for erect types; trailing types can spread much wider |
| Stem | Hollow, mostly hairless; main stem up to 1 cm thick |
| Leaves | Three hairless leaflets per leaf; terminal leaflet symmetrical, about 10 cm long |
| Flowers | Pale violet or mauve, about 2.5 cm across, borne in clusters |
| Pods | 10 to 20 cm long, 0.5 to 1 cm diameter; greyed orange when ripe |
| Root system | Deep taproot; can reach 95 cm or more 8 weeks after sowing; good drought access |
| Maturity period | 50 to 160 days depending on variety and conditions |
| Optimum temperature | Around 30°C; frost intolerant |
The Four Main Cowpea Growth Habits
Cowpea shows a high degree of morphological diversity within the species. The most important distinction for farmers is the growth habit, which determines how the plant behaves in the field, how easily it is harvested, and which farming purpose it best serves.
1. Erect Type
Erect cowpea varieties grow upright with a compact structure, typically reaching 50 to 80 cm in height. They are more determinate in their growth, meaning they reach maturity within a more predictable time frame. Erect types are easier to harvest mechanically and are better suited for direct grain harvesting or cut-and-carry forage systems. They are generally preferred for smallholder grain production because the plant structure is more manageable and less prone to tangling.
2. Semi-Erect Type
Semi-erect varieties sit between fully erect and prostrate types. They have some spreading tendency but still maintain enough vertical structure for reasonable mechanical or manual harvesting. Many dual-purpose varieties bred for both forage and grain production fall into this category. Semi-erect types work well in systems where the farmer wants flexibility across seasons.
3. Prostrate or Trailing Type
Trailing or prostrate cowpea varieties spread along the ground and can cover substantial areas. They produce a high volume of leafy biomass, making them well suited for soil cover, erosion control, and as a cover crop ahead of a following cereal planting. As a forage crop for grazing, trailing types provide good ground coverage but require careful management to avoid trampling by livestock before the plants are fully established.
4. Climbing or Vine Type
Vine types are the most commonly used for forage and silage production. They produce the largest volume of leafy material per plant, which translates into higher forage biomass per hectare. Vine-type cowpea is particularly well suited for intercropping with taller cereals like maize or sorghum, where the vine grows alongside and between the cereal rows without competing aggressively. These varieties are also the best choice for cover cropping before transitioning the field to another crop.
Choosing the Right Cowpea Type for Your Farm Purpose
| Farm Purpose | Recommended Growth Habit | Key Reason |
|---|---|---|
| Grain production | Erect or semi-erect | Easier to harvest, more determinate, higher grain-to-biomass ratio |
| Forage and silage | Vine or semi-erect | Higher leaf biomass, better suited for cut-and-carry or bale silage |
| Grazing (direct) | Erect or semi-erect | More resistant to trampling, easier regrowth after grazing |
| Cover crop / green manure | Trailing or vine | Maximum ground coverage, best nitrogen contribution to soil |
| Intercropping with cereals | Vine or semi-erect | Grows alongside cereal rows without shading them out at early stages |
| Dual-purpose (grain + forage) | Semi-erect | Balances grain yield and forage biomass in one crop cycle |
| Hay production | Erect or semi-erect | Easier to cut, ted, and dry uniformly compared to trailing types |
Why Cowpea Is Good for Cattle: Key Facts
With the plant characteristics understood, the question of whether cowpea is good for cattle is straightforward. The answer is yes, with a few practical conditions worth knowing.
- The quality of cowpea forage is highest when harvested before full maturity. Although end-of-season forage has lower nutritional quality, it still outperforms many common tropical grasses on a protein basis, making it a reliable feed even outside the optimal harvest window.
- Good crop management during the growing season produces forage with crude protein levels of 19 to 24%, depending on the plant part and harvest timing. Leaves consistently deliver higher protein than stems.
- Livestock across many countries have consumed cowpea forage without palatability problems. The taste and texture of fresh cowpea forage is readily accepted by cattle, sheep, and goats.
- Cowpea can cause bloat in cattle when grazed fresh on a lush, young sward, particularly on an empty stomach. This risk is minimized by introducing livestock to cowpea gradually, ensuring animals have consumed dry roughage beforehand, and avoiding grazing during or immediately after heavy dew or rain.
- Preserving cowpea as silage maintains its nutritional quality through the dry season and eliminates the bloat risk associated with fresh grazing.
- There is consistent evidence of body weight gains in cattle fed cowpea-based rations, including in lactating cows where cowpea has been linked to improvements in milk yield.
No Part of the Cowpea Plant Goes to Waste
One of the most practical advantages of cowpea for mixed farming systems is that virtually no part of the plant needs to be discarded. Young leaves can be harvested as human food or fresh cattle fodder from as early as four weeks after planting. Immature pods and green seeds are consumed as vegetables. Dried seeds are processed into food for human consumption. The whole plant residue after grain harvest, known as haulm, is fed to livestock as a dry roughage source. Even pod husks after threshing can be fed to cattle as a low-cost fiber supplement.
Storing cowpea seed after harvest in dry conditions in a sealed container can extend seed viability for up to one year, giving farmers a reliable seed reserve for the next planting cycle.
The more unproductive or marginal land on a farm can be planted with cowpea, which tolerates infertile, sandy, and slightly acid soils that most other legumes struggle with. This makes it a practical option for expanding feed production without drawing resources away from higher-quality land.
Frequently Asked Questions about Cowpea Plant Types and Forage Use
Q: What is the difference between vine-type and erect cowpea for forage production?
Vine-type cowpea produces a much larger volume of leafy biomass per plant compared to erect types because the trailing or climbing stems generate more leaf area across the ground or up a support crop. For forage and silage production, this higher leaf yield translates directly into more protein-dense material per hectare. Erect types are better suited for grain production or direct grazing because they are easier to harvest and stand up better to livestock traffic. If your primary goal is making silage or cut-and-carry fodder for stall feeding, vine or semi-erect types will consistently outperform erect varieties in total forage yield.
Q: How deep are cowpea roots and why does it matter for drought tolerance?
Cowpea has a strong deep taproot system that can penetrate to 95 cm or more within eight weeks of sowing. This deep root architecture allows the plant to access soil moisture at depths that many shallow-rooted crops cannot reach during dry periods. This is a primary reason cowpea maintains growth and forage production when surface soils are dry. For breeders farming in semi-arid areas or regions with unreliable rainfall, this deep root depth is one of the most valuable characteristics of the crop, as it allows cowpea to continue producing usable forage at a time when other feed options are already exhausted.
Q: Can cowpea be grazed directly by cattle or does it need to be cut first?
Cowpea can be grazed directly, but it requires careful management. The main risks with direct grazing are bloat when cattle enter a lush young sward on an empty stomach, and trampling damage before the plants are fully established. To reduce bloat risk, always ensure cattle have consumed adequate dry roughage before entering the cowpea paddock, and avoid grazing during wet or dewy conditions. Light grazing pressure, allowing most of the plant to remain standing, also supports better regrowth for subsequent cuts. For high-stocking operations, cutting and carrying the forage to the animals rather than allowing direct grazing gives better control over intake and reduces plant damage.
Q: At what growth stage should cowpea be harvested for the best forage quality?
For the best balance of protein content, digestibility, and forage yield, cowpea should be harvested at the early to mid-podding stage, when the pods have formed but seeds are not yet fully mature. At this point, the leaves still contain over 20% crude protein and the plant has reached sufficient biomass to make harvest efficient. Harvesting too early gives very high protein but low total yield. Harvesting too late results in higher fiber, lower protein digestibility, and more leaf shatter, which reduces the nutritional value of both fresh forage and silage. For silage production, the early podding stage also coincides with a moisture level suitable for fermentation without excessive effluent.
Q: What soil types are suitable for growing cowpea?
Cowpea performs across a wide range of soil types, from light sandy soils to moderately heavy clay soils, provided drainage is adequate. It has better tolerance for infertile, sandy, and slightly acid soils than most other legumes, which is why it is widely used on marginal land. The preferred soil pH range is 5.5 to 7.0. Cowpea does not tolerate waterlogged or flooded conditions, so well-drained fields or raised bed systems are important in high-rainfall areas. On lighter soils, cowpea often outperforms expectations because its deep taproot accesses subsoil nutrients and moisture that shallow-rooted crops cannot reach.
This article was last reviewed and updated by the Silopak Editorial Team on May 30, 20256. Our team periodically revisits published content to ensure accuracy, relevance, and alignment with current best practices in livestock feed management and silage preservation.
