Lablab Rongai Green Manure Seeds

Lablab ‘Rongai’ Green Manure Seeds

Botanical Name: Lablab purpureus
Common Name: Rongai Lablab

Lablab ‘Rongai’ is a vigorous warm-season annual legume used for green manure, cover cropping, forage, nitrogen fixation, weed suppression and summer soil improvement. It produces strong leafy biomass and dense ground cover, helping protect soil from heat, erosion and weed competition during the warmer months.

Rongai is a late-flowering lablab type, making it especially useful where extended vegetative growth and biomass are desired before incorporation. It is well suited to vegetable gardens, orchards, food forests, paddocks, market gardens and regenerative farming systems in warm climates.

• Warm-season lablab green manure and cover crop seed.
• Late-flowering Rongai type for extended leafy biomass production.
• Fixes nitrogen when compatible rhizobia are present.
• Dense growth helps suppress weeds and protect bare soil.
• Drought tolerant once established and well suited to warm conditions.
• Useful for orchards, food forests, gardens, paddocks and crop rotations.
• Can be used as forage, chop-and-drop mulch or incorporated green manure.

Plant Details

• Plant Type: Warm-season annual or short-lived perennial legume in frost-free climates
• Botanical Name: Lablab purpureus
• Common Name: Rongai Lablab
• Growth Habit: Trailing or climbing vine with vigorous leafy growth
• Growth Height: Approximately 1.5–3 m with support; lower when grown as ground cover
• Flowering: Late flowering compared with many other lablab types
• Root System: Strong legume root system with nitrogen-fixing potential
• Frost Tolerance: Low; frost sensitive
• Drought Tolerance: Good once established
• Best Position: Full sun

Best Uses

• Warm-season green manure
• Summer cover crop
• Nitrogen fixation
• Weed suppression and soil cover
• Organic matter production
• Orchard and food forest inter-rows
• Vegetable garden rotations
• Forage and grazing systems
• No-dig chop-and-drop mulch
• Regenerative farming and cover crop blends

Sowing Information

• Best Sowing Time: Spring to summer once soil is warm and frost risk has passed
• Germination Time: 7–14 days in warm, moist conditions
• Ideal Soil Temperature: Around 20–30°C for strong germination
• Sowing Depth: 3–5 cm
• Position: Full sun
• Soil Type: Adaptable to many soils; performs best in fertile, well-drained soil
• Watering: Keep moist during germination and establishment; drought tolerant once established
• Sow Where: Garden beds, orchards, food forests, paddocks, trellises, fences, inter-rows and summer fallow areas
• Inoculation: For strongest nitrogen fixation, use a suitable warm-season legume inoculant where available.

Sowing Rate and Coverage

Seed Quantity Guide

Coverage is a guide only. Use higher sowing rates for faster canopy closure, stronger weed suppression, poor seedbeds, exposed sites or areas with bird pressure.

When to Sow Lablab ‘Rongai’ in Australia

How to Sow Lablab ‘Rongai’ Seeds

1. Wait until frost risk has passed and soil is warm.
2. Prepare a firm, weed-free seedbed.
3. Broadcast seed evenly or sow in rows.
4. Cover seed with approximately 3–5 cm of soil.
5. Press or roll lightly for good seed-to-soil contact.
6. Water after sowing and keep moist until seedlings establish.
7. Use suitable warm-season legume inoculant where nitrogen fixation is a priority.

Management

• Water regularly during establishment.
• Once established, Rongai Lablab is drought tolerant but produces more biomass with moisture.
• Provide support if growing as a climbing vine on trellises or fences.
• Allow plants to spread as ground cover if using for green manure or weed suppression.
• Cut before heavy seed set if volunteer plants are not wanted.
• Use as chop-and-drop mulch or incorporate into the soil.

Harvest and Incorporation

For green manure use, cut or slash Lablab ‘Rongai’ when strong leafy biomass has formed, usually before heavy flowering or pod set. Incorporate the chopped material into the soil 2–4 weeks before planting the next crop, or leave it on the surface as mulch in no-dig systems. Because Rongai is late flowering, it can provide a longer vegetative growth window for biomass production.

Forage and Grazing Use

Lablab is also used as a warm-season forage legume. If grazing, manage carefully to avoid overgrazing and allow plants time to recover. Grazing suitability and feed management depend on livestock type, growth stage, local conditions and overall pasture mix.

Soil Benefits and Use

Lablab ‘Rongai’ helps improve soil by supporting nitrogen fixation, producing leafy biomass, protecting bare ground, suppressing weeds and feeding soil biology when chopped and returned. It is especially useful as a summer soil-building crop in orchards, food forests, vegetable rotations, paddocks, market gardens and regenerative farming systems.

Important Notes

• Lablab ‘Rongai’ is frost sensitive and should be sown into warm soil.
• Nitrogen fixation is strongest when compatible rhizobia are present in the soil or applied as inoculant.
• Avoid prolonged waterlogging, especially during germination.
• Cut before seed set if self-sown plants are not wanted.
• Rongai is late flowering, making it useful for extended biomass production.
• Use higher rates where fast cover or weed suppression is important.

Quick Growing Guide