Yellow Bells

Tecoma stans, the yellow bells or piili ghanti, is a fast, drought-hardy flowering shrub that makes a cheerful, low-water windbreak and screen on hot, poor ground. The honest reason a grower might plant it is quick, tough perimeter colour and shelter where little else flowers through the dry season. The honest warning that comes with it is just as important: yellow bells seeds prolifically on the wind and is a declared invasive weed in several countries, so plant it only where you can keep it contained, and never assume it will stay put.

Where it thrives

Piili ghanti suits the warm Punjab plains and the Sindh coast, thriving in full sun on a wide range of soils, including dry and stony ground. POWO records it as native to tropical and subtropical America,¹ and reviews note it tolerates drought, adapts to many soils, and resists most pests, flowering from its second year onward.² Those same traits that make it easy are what make it weedy. It dislikes frost and heavy wet soil; otherwise it is almost too willing to grow, which is the catch.

Role in the system

Yellow bells works as a secondary-stratum windbreak and boundary screen on the outer, exposed edges of a food forest, kept under tight management. Its dense, fast growth slows wind and provides shelter, and its long flowering supports pollinators. But its standout trait is also its hazard: it produces copious wind-borne seed and behaves as an aggressive coloniser, so it must never be left to set seed freely into a working system or beyond the farm boundary.³ It is not a nitrogen fixer. Treat it as a managed perimeter shrub in the support layer, valued for shelter and pollinator forage but pruned hard to prevent it spreading into the productive guilds.

Growing it

Two decisions decide whether it helps or harms. First, containment: deadhead and prune before the slender seed capsules ripen and split, because letting it seed is how it becomes a weed you regret; this is the single most important management call. Second, placement: site it on a defined boundary where you can patrol for seedlings, not scattered through the system where volunteers will be hard to find. It strikes from cuttings and grows from seed; space plants about 1.5 metres apart for a screen. Water through establishment, then little is needed. Cut hard after each flush to keep it dense and seed-free.

What you get

What you get is a fast, drought-tolerant windbreak and a long season of yellow flowers that feed bees, rather than a food or fodder yield. Its value is shelter, pollinator forage, and quick cover on exposed perimeter ground, achieved cheaply from easy planting material. The economic angle is low-cost protection of inner plantings, weighed honestly against the labour of keeping it from seeding around. Where you cannot commit to that management, choose a less weedy windbreak instead.

Sourcing notes

Propagate from seed or semi-hardwood cuttings; both are easy, which is part of the problem. Companion it only as a managed boundary screen, never as an internal guild plant. The defining sourcing rule is restraint: pull volunteer seedlings promptly and keep it well away from canals, drains, and field edges where its wind-blown seed could escape onto neighbouring land or waterways.

Sources

1. POWO (2024). “Tecoma stans (L.) Juss. ex Kunth.” Plants of the World Online, Royal Botanic Gardens, Kew.
2. Gilman, E.F., et al. (2025). “Tecoma stans: Yellow Elder.” UF/IFAS Extension (ENH783/ST625).
3. Singh, S., et al. (2024). “A comprehensive review on ecology, life cycle and use of Tecoma stans (Bignoniaceae).” Botanical Studies.