Sweet Potato

Sweet potato (Ipomoea batatas), shakarqandi in Pakistan, is a sprawling, fast vine grown for its starchy storage roots, and the honest reason to give it space is that almost nothing covers bare ground as quickly or feeds you in as many ways: roots for the table, leaves and vines for livestock, and a dense living carpet that smothers weeds while it grows.

Where it thrives

The species is native to Mexico south to Venezuela and Ecuador and grows primarily in the seasonally dry tropical biome, which makes the warm Punjab plains and the Sindh coast a good fit.¹ It is a scrambling tuberous geophyte: a low, creeping plant with slender vines that run several metres, building roots below while the foliage spreads above.¹ It wants warmth, full sun and free-draining soil, and it is reasonably drought-tolerant once away, with the vines doubling as an emergency feed in dry spells.²

Role in the system

Sweet potato is a groundcover pioneer, and its standout job in a guild is living mulch. The rapidly spreading foliage covers a bed completely and suppresses weeds by sheer shading: in trials against an aggressive invasive weed, sweet potato covered 70 to 90 percent of the competitor’s stems and leaves and sharply cut its biomass through faster growth and competition for light and nutrients.³ Run between young fruit trees or after a main crop, that dense mat shades the soil, holds moisture, limits erosion in the rains, and builds organic matter as old leaves drop. It is a fertility and soil-protection layer that also yields a staple food. The vines are a second harvest: a very palatable fodder for cattle, goats, sheep, pigs and rabbits, fed fresh, dried or as a fruity-smelling silage, with leaf protein running high in the dry matter.² As a low, soil-covering staple it stacks food, fodder and living mulch into a single ground-plane planting, the classic role of a groundcover pioneer in early succession.

Growing it

Plant from vine cuttings (slips) pushed into warm, loose, well-drained soil; they root fast and the vines knit into full cover within weeks. Give it sun and space to run, keep it weed-free only until the canopy closes, then let the mat do the weeding. Harvest roots when the leaves yellow, lifting carefully to avoid bruising. In dry conditions where soil cracks, organic mulch over the bed reduces sweetpotato weevil reaching the roots and the damage it causes.⁴

What you get

You get storage roots for the kitchen, a heavy cut of nutritious vine fodder, and a season of weed-suppressing, soil-holding ground cover from one planting.²³ Few crops return so much from so little input.

Sourcing notes

Start from vine cuttings taken from healthy, virus-free stock rather than market tubers, since clean planting material is the single biggest factor in a good crop. Source a locally adapted variety, take your own slips from the best plants each year, and choose a dual-purpose type if you want both heavy roots and abundant fodder vine.

Sources

1. Royal Botanic Gardens, Kew (2024). “Ipomoea batatas (L.) Lam.” Plants of the World Online.
2. Heuzé, V., Tran, G., Hassoun, P. et al. (2015). “Sweet potato (Ipomoea batatas) forage.” Feedipedia, INRAE/CIRAD/AFZ/FAO.
3. Wang, A., Li, Y., Yan, P. et al. (2015). “Suppression of the invasive plant mile-a-minute by local crop sweet potato.” BMC Ecology.
4. Stathers, T., Mvumi, B. M., Nyabako, T. et al. (2019). “Organic mulches reduce crop attack by sweetpotato weevil (Cylas formicarius).” Scientific Reports.