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How to Grow Rosemary

Rosemary is a beautiful, aromatic herb that thrives on neglect - as long as you understand its Mediterranean origins. This drought-tolerant perennial prefers dry conditions, excellent drainage, and lots of sun. Once established, rosemary is incredibly long-lived and can grow into an impressive shrub. The key to success is understanding that rosemary wants the opposite of most plants: let it dry out, give it gritty soil, and do not overwater.

Difficulty:Intermediate

Time to Harvest:90+ days

Sun Needs:6-8 hours full sun

Quick Facts

Botanical Name: Salvia rosmarinus

Plant Type: Evergreen perennial shrub

Hardy Zones: 7-10 (overwinters outdoors)

Mature Size: 2-6 feet tall and wide

Sunlight: Full sun (6-8 hours)

Watering: Drought tolerant - let dry between

Soil: Sandy, well-draining, pH 6.0-7.0

Container: Terracotta with drainage

Common Problems

Root Rot

Cause: Overwatering and poor drainage - most common killer

Solution: Water only when soil is completely dry. Use fast-draining soil with sand/perlite. Terracotta pots help. Remove from wet soil immediately if root rot suspected.

Powdery Mildew

Cause: High humidity, poor air circulation

Solution: Improve air circulation. Space plants adequately. Water at soil level. Remove affected branches. Rosemary prefers dry air.

Brown Tips

Cause: Root rot, cold damage, or salt buildup from fertilizer

Solution: Check roots for rot. Protect from cold winds. Flush soil to remove salt buildup. Prune affected tips.

Leggy Growth

Cause: Insufficient light or lack of pruning

Solution: Move to sunnier location. Prune regularly after flowering to maintain compact shape. Pinch tips to encourage bushiness.

FAQ

Is rosemary a perennial?

Yes! Rosemary is a woody perennial shrub in zones 7-10, surviving winters and growing larger each year. In colder zones (6 and below), grow as annual or bring indoors for winter. Mature plants can reach 3-5 feet tall and wide in warm climates.

Why is my rosemary dying?

The most common cause is overwatering - rosemary is drought-tolerant and hates wet roots. Other issues: poor drainage, high humidity, root rot, or cold damage. Let soil dry between waterings. Improve drainage with gritty soil. Ensure good air circulation.

Can rosemary grow indoors?

Yes, but it's challenging. Rosemary needs 6-8 hours of direct light, excellent drainage, and good air circulation. Most indoor failures come from overwatering, low light, or stagnant air. Use a terracotta pot with fast-draining soil. Water only when dry.

How do I propagate rosemary?

Take 4-6 inch softwood cuttings in spring or summer. Remove lower leaves, dip in rooting hormone (optional), and plant in moist, sandy mix. Keep humid but not wet. Roots develop in 4-8 weeks. Success rate is high with this method.

When should I harvest rosemary?

Harvest anytime once plants are established (after first year). Cut sprigs as needed, never removing more than 1/3 of plant. Best flavor is just before flowering. Morning harvest has highest oil content. Rosemary stays fresh longer than most herbs.

How do I overwinter rosemary?

In zones 7+, mulch heavily and place in sheltered spot. In colder zones, bring pots indoors before frost. Place in sunniest window, reduce watering, and ensure air circulation. Mist occasionally. Many gardeners treat rosemary as annual rather than struggle with overwintering.

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