Centro

Centro (Centrosema pubescens) is a vigorous twining perennial legume long used as a cover crop and pasture species across the wet tropics. POWO records its native range as Mexico to tropical America, with the wet-tropical biome as its core.¹ There is no settled Urdu name; the plant is sold under the cultivar name centro. For a Pakistani grower in the wetter pockets of Sindh or the canal-irrigated Punjab plains, it is the dependable understory legume to thread under young rubber-style perennials, fruit trees and palms.²

Where it thrives

Centro is a wet-tropical species. Feedipedia places its best performance between 22 degrees south and 22 degrees north, at altitudes below 1600 metres, with annual rainfall between roughly 1500 and 1700 mm and minimum temperatures above 15 degrees Celsius.² It tolerates short waterlogging and partial shade and holds on through dry spells, but frost kills it. In Pakistan that maps to the wetter end of the lower Indus, irrigated orchard land in central Punjab and warm pockets of Sindh; for drier ground siratro is a better fit.³

Role in the system

Centro sits in the groundcover stratum as a pioneer climber. It does three jobs in a guild. It fixes large amounts of atmospheric nitrogen, with field estimates of 120 to 270 kg per hectare per year through its Bradyrhizobium nodules.² It forms a dense soil cover, four to eight months from sowing, that smothers weeds and slows erosion under widely spaced tree crops.³ And it persists three to six years under a young plantation canopy, gradually thinning out as the trees close up, which makes it a planned successional cover rather than a permanent fixture.³ Treat it as a deliberate understory under young perennials, not as a companion in a vegetable bed where it would climb everything.

Growing it

Establish from seed. Hard seed is high, so scarify mechanically before sowing and inoculate with the appropriate Bradyrhizobium strain on fresh ground.³ Drill or broadcast at roughly 5 kg per hectare into a clean, firm seedbed at the start of the monsoon.³ The crop is slow in the first six to eight weeks while it builds nodulation and root depth; do not mow or graze it through that window. After establishment a single light cut or a controlled grazing pass each season keeps it thickening laterally rather than running up into the canopy.

What you get

The product is fertility, ground cover and high-quality forage. Pure stands can return 5 to 14 tonnes of green matter per hectare per year, with plant tissue carrying 2.4 to 3.2 percent nitrogen.²³ Under tree crops the leaf litter and root turnover lift soil nitrogen for the orchard above; in mixed-grass pastures the protein boost carries cattle through the dry season without bloat.²

Sourcing notes

Seed is not common in Pakistani retail and is most reliably brought in through a forage-research outfit; ask for scarified seed and a fresh batch with an inoculant pack. Plant it under young citrus, mango, banana or guava once the canopy is large enough to live with a vigorous understory. Keep it well clear of vegetable beds and short herb lines, where it will climb okra, brinjal, chilli and pole beans and pull them down.

Sources

1. Royal Botanic Gardens, Kew (2024). “Centrosema pubescens Benth.” Plants of the World Online.
2. Heuzé, V., Tran, G., Boval, M., Lebas, F. (2016). “Centro (Centrosema molle).” Feedipedia, INRAE-CIRAD-AFZ-FAO.
3. Plant Resources of South-East Asia (PROSEA) / Pl@ntUse (2016). “Centrosema pubescens (PROSEA).” PROSEA Foundation.