Growing Temperate Annuals in Tropical Climates: Seasonal Strategies for Bangkok

Annuals in Year‑Round Heat

Cool‑season annuals like impatiens, sweet william, and globe amaranth can be grown in Bangkok, but they need protection from the intense afternoon sun and constant irrigation.

Best Practices

• Plant during the cooler months (November‑February) or site them where they receive only morning sun.
• Water daily, sometimes twice a day, during hot periods.
• Expect a lifespan of roughly September through May; fungal diseases usually end their run once the rainy season intensifies.

Unlike in the Northeast, they won't return on their own—replant each cool season.