Growing Hollyhocks in Zone 4B

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

Zone 4B has a short growing season — start seeds indoors when possible and use season-extending techniques like cold frames and row covers.

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 4B

USDA Hardiness Zone 4B has an average last spring frost around May 1 and first fall frost around Oct 1. 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.