Growing Fennel in Zone 10B

Fennel is a beautiful, aromatic herb with a mild licorice flavor. Both bulb and herb types are worth growing.

Zone 10B has a very long growing season with mild winters. Many crops can be grown nearly year-round with successive plantings.

Top Growing Tips

• Direct sow — fennel doesn’t transplant well
• Bulb fennel needs cool weather to form; herb fennel is more heat-tolerant
• Keep consistently moist for best bulb development
• Self-seeds prolifically if allowed to flower
• Attracts swallowtail butterflies — their caterpillars love it

Companion Planting

Good companions: dill (same family, attracts same beneficials)

Avoid planting near: most vegetables — fennel is somewhat allelopathic (inhibits nearby plants). Grow separately.

Harvest Timeline

Bulb: 65-90 days from seed; herb leaves anytime

About Zone 10B

USDA Hardiness Zone 10B has an average last spring frost around Jan 15 and first fall frost around Dec 31. All planting dates above are calculated from these frost dates. Your specific location may vary — check with your local extension office for the most accurate dates.