- Fennel seeds do not need to be soaked before planting.
- Fennel seeds require light for germination, so do not cover them with soil. Instead, press them lightly into the soil surface.
- Fennel seeds germinate best at temperatures between 60-70°F (15-21°C).
- Fennel seeds typically germinate within 7-14 days.
- Fennel can be started either indoors or outdoors, depending on your preference.
- For outdoor planting, start fennel seeds in the spring after the last frost date in your area.
- Fennel is hardy in USDA zones 5-10.
- Fennel is frost hardy and can survive light frosts.
- Fennel is a perennial herb.
- Space fennel seeds at least 12-18 inches (30-45 cm) apart.
- Thin seedlings to one plant every 12-18 inches (30-45 cm) when they have developed their first true leaves.
- Space fennel plants at least 18-24 inches (45-60 cm) apart.
- Fennel requires at least 6 hours of direct sunlight per day to grow properly.
- Mature fennel plants can grow up to 3-5 feet (90-150 cm) tall.
- Transplant fennel seedlings outdoors after the last expected frost date in your area.
- Fennel produces small, yellow flowers that are arranged in large, flat-topped clusters. The flowers bloom in the summer and are followed by seeds that are commonly used in cooking and baking.
