Thai Red Chili Hot Peppers in a white dish on a white background.
Thai Red Chili Peppers in teaspoon with coins for size reference.
Thai Red Chilis in light green bowl on white background.
Thai Red Chili Hot Peppers in a white dish on a white background.
Thai Red Chili Peppers in teaspoon with coins for size reference.
Thai Red Chilis in light green bowl on white background.

Hot Pepper Seeds,
Thai Red Chili

4.322 ReviewsSKU: #HPP107Min. seed count: 25
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Description

(Capsicum annuum). This hot little heirloom chili from Thailand is used in almost every Thai dish. The small, 1-inch pointed fruit is easy to dry and fantastic in both traditional and contemporary recipes. The ornamental plants are loaded with bright red peppers packed with pungent heat.

Growing Tips: The Thai Red Chili is a spicy heirloom pepper that requires warm and sunny conditions. It grows best in rich, well-draining soil. Keep the soil temperature between 80–85 F for optimal germination, using a heat mat to help keep the soil warm.

Plant Details

Botanical Name
Capsicum annuum
Life Cycle
Annual
Sun Requirement
8–12 hr.
Days to Germinate
7–10
Days to Maturity
70–90
Planting Depth
¼ in.
Plant Spacing
14–18 in.
Ideal Temperature
70–95°F
Frost Hardy
No

When to Grow

Thai Red Chili peppers thrive in the warmth of late spring through summer. Start indoors in bright light 8-12 weeks before the last frost date. Transplant outdoors after the last frost when both soil and air temperatures have warmed. Check your local area’s frost dates to determine the best planting time. If you’re not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

How to Sow and Plant

Sow seeds about 1/4 inch deep in well-draining soil. Keep the soil consistently moist but not waterlogged, and ensure the seeds receive ample light. Once seedlings have true leaves and outdoor temperatures are warm, transplant spacing them 14-18 inches apart for good air circulation. For container planting, use pots at least 12 inches deep with good drainage​.

How to Grow

Thai Red Chili plants need around 8-12 hours of sunlight daily. Water deeply and regularly, keeping the soil moist but not soggy. Fertilize every 4–6 weeks with a balanced, low-nitrogen fertilizer to support healthy growth and fruiting. Pruning early flowers can encourage bushier growth and higher yields. Harvest when the fruit is a vibrant red color.

How to Save Seeds

  • Peppers are mainly self-pollinating, but bees occasionally work pepper flowers as well.
  • To be absolutely sure that you will not have any crossing, different varieties should be isolated by at least 500 feet.
  • To save seed, allow the fruit to mature fully; then simply remove seeds.
  • It is a good idea to wear gloves when working with very hot peppers, and to consider wearing a mask when working with a large quantity of dried seeds.
  • Let seeds dry for a week before storing them in a jar.
  • Pepper seeds will remain viable for up to 5 years.

FAQ

How hot are Thai Red Chili peppers?

They have a Scoville rating of 50,000–100,000, providing a high level of heat similar to cayenne or habanero peppers.

How often should I water Thai Red Chili plants?

Water deeply once or twice a week, keeping the soil consistently moist but not waterlogged. Adjust the frequency based on weather conditions, as hot, dry days may require more frequent watering.

When are Thai Red Chili peppers ready to harvest?

Thai chilis reach full maturity 70–90 days after transplanting, typically turning bright red when fully ripe. At this stage, they will have the best flavor and heat intensity.

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