Growing Thai Chili Peppers
Thai chili peppers (Capsicum annuum) are small, slender peppers that pack serious heat — typically 50,000 to 100,000 Scoville units. Also known as bird's eye chili or prik kee noo, they are essential in Thai, Vietnamese, and other Southeast Asian cuisines. The plants are prolific producers, attractive in the garden, and fairly straightforward to grow in warm conditions.
Starting Seeds
Thai chilies have a long growing season (80–100 days to maturity), so start seeds indoors 8–10 weeks before the last frost date. Pepper seeds germinate best at warm soil temperatures (80–85°F); a seedling heat mat speeds things up. Plant seeds 1/4 inch deep in sterile seed-starting mix. See Seed Starting Herbs Indoors for detailed setup instructions. Germination takes 7–21 days.
Transplanting and Growing
Transplant outdoors after all frost danger has passed and nighttime temperatures are consistently above 55°F. Space plants 18–24 inches apart in full sun. Thai chilies need well-draining soil, regular watering, and moderate fertilization — too much nitrogen produces leafy plants with fewer peppers. A balanced fertilizer applied every 3–4 weeks is sufficient.
The plants do exceptionally well in containers — a 3–5 gallon pot per plant. They also thrive in raised beds where the soil warms up quickly.
Harvesting
Peppers are ready to pick when they turn bright red, typically 80–100 days after transplanting. You can harvest them green for a milder heat. Use scissors or a sharp knife to cut the stem — pulling can damage the plant. A single healthy plant can produce hundreds of peppers over a season.
Preservation
Thai chilies dry beautifully. String them on thread and hang in a dry, airy spot, or use a food dehydrator. Dried chilies keep for months in an airtight container. They also freeze well — spread them in a single layer on a baking sheet, freeze, then transfer to a bag. See Preserving Herbs for Winter for more methods.