Bougainvillea Care: Soil, pH, Fertilizer, and Flowering Tricks

Soil & pH

• Ideal: Rich, loamy, well-drained; pH 6.0–6.5 (tolerates up to 7.0).
• Sandy soil: Amend with 1 part compost : 2 parts native soil; use coated slow-release fertilizer (Osmocote 14-14-14).
• Heavy clay: Amend 1:1 with compost for aeration—critical for bougainvillea.

Fertilizer Program

• In-ground: Balanced 10-10-10 or similar, 4–5 times per year.
• Container: Slow-release 14-14-14 at planting + liquid 20-20-20 monthly during active growth.
• Reduce/winter: Withhold fertilizer in winter; keep barely moist.

Flowering Induction

If blooming stops, impose mild drought stress (withhold water until slight wilting). This often triggers a flush of flowers. Also, keep slightly root-bound in containers—less soil volume = more blooms, less vegetative growth.

Cold Hardiness

• Outdoors year-round only in USDA zones 9–10 (zone 8 with protection).
• In colder zones: move pots indoors, keep >32°F, minimal water, no fertilizer until spring.