Growing Hollyhocks in Zone 10B

Hollyhocks are old-fashioned cottage garden classics with towering spires of blooms that bring vertical drama to any planting.

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

• Biennial or short-lived perennial — start new seeds each year for continuity
• Plant against a fence or wall for support and classic cottage look
• Rust disease is common — remove affected leaves promptly
• Self-seeds reliably; let some plants go to seed for next year’s display
• Single-flowered varieties are better for pollinators than doubles

Companion Planting

Good companions: roses, lavender, echinacea, delphiniums

Avoid planting near: Areas with poor air circulation (worsens rust disease)

Harvest Timeline

Ornamental; harvest seed heads when paper-dry for saving

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.