Planting Bougainvillea in Arizona: Timing, Spacing, and Frost Protection

Bougainvillea thrives in Arizona’s low deserts (Phoenix, Yuma, Parker) but is frost-sensitive. In higher elevations or cooler microclimates, extra care is needed.

Planting Guidelines

• Best planting time: Spring (March–April) or early fall (September–October). Avoid planting in late fall (November) when frost risk rises.
• Site: Full sun, well-drained soil. Can be planted against a south- or west-facing wall for reflected heat.
• Hole preparation: Dig slightly wider and deeper than root ball. Set plant so root crown sits 2–3 cm below soil surface.
• Spacing: 1.5–2 m (5–6 ft) apart; they spread vigorously.
• Watering: Deep soak weekly during establishment; thereafter, water deeply every 10–14 days in summer, less in winter.
• Fertilizing: Side-dress with composted manure in spring and midsummer. Avoid high-nitrogen fertilizers that promote foliage over flowers.

Frost Protection

• Young plants: Cover with frost cloth or blanket during freeze warnings.
• Established plants: May die back to ground but often resprout from base.
• Container plants: Move to protected patio or garage during cold snaps.

With proper siting and minimal winter protection, bougainvillea provides spectacular color nearly year-round in southern Arizona.