Growing Rosemary in Zone 4B

Rosemary is a woody, perennial herb in warm climates and a fragrant container plant in cold ones.

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

• Perennial in zones 8+ — treat as annual or bring indoors in colder zones
• Needs excellent drainage — hates wet feet
• Start from cuttings or transplants (very slow from seed)
• Drought-tolerant once established
• Prune regularly to prevent woody, leggy growth

Companion Planting

Good companions: beans, cabbage, carrots, sage

Avoid planting near: none in particular

Harvest Timeline

Snip sprigs anytime once plants are 6+ inches

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.