Rosemary
Rosmarinus officinalis
Native to the Mediterranean region, rosemary has silvery needle-like foliage and delicate flowers. Popular for potted plant sales and with chefs. NOTE: Germination is naturally low and variable. Edible Flowers: Although the flowers are small, they have a bold rosemary flavor. They should be used fresh as a garnish for savory dishes and salads, and pairs well with roasted vegetables, fruits, or whipped cream.
Harvest
90-120d
Days to harvest
Sun
Full sun
Zones
6–10
USDA hardiness
Height
5 feet
Planting Timeline
Showing dates for Rosemary in USDA Zone 7
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Rosemary · Zones 6–10
Growing Details
Zone-by-Zone Planting Calendar
Complete Growing Guide
Select a sunny location with excellent drainage for your rosemary — this Mediterranean native absolutely cannot tolerate waterlogged soil. If you have heavy clay, create raised beds or amend with coarse sand and gravel rather than compost, as rich soil can actually weaken the plant's flavor and cold hardiness. In zones 6-7, plant against a south-facing wall for extra winter protection.
Skip starting from seed unless you enjoy frustration — rosemary seeds have poor germination rates and take months to develop. Instead, purchase nursery plants in spring after your last frost date, or take 4-6 inch cuttings from established plants in late summer. For cuttings, strip the lower leaves, dip in rooting hormone, and plant in sandy potting mix. Keep barely moist until roots develop in 6-8 weeks.
When transplanting, dig holes only as deep as the root ball and twice as wide. Rosemary's roots spread horizontally rather than deep. Space plants 2-3 feet apart, as mature specimens can reach 4 feet wide. Water thoroughly after planting, then back off — overwatering is the fastest way to kill rosemary.
Fertilize sparingly if at all. A light application of balanced fertilizer in early spring is sufficient, but established plants often thrive with no feeding. Rich soil produces lush growth that's less flavorful and more susceptible to winter damage. In containers, use a Mediterranean herb blend potting mix or add extra perlite to regular potting soil.
Prune annually after flowering to maintain shape and prevent woody centers. Never cut back more than one-third of the plant at once, and avoid cutting into old, woody stems as they rarely regenerate. Regular light harvesting serves as pruning and encourages bushy growth.
Common mistakes include overwatering (leads to root rot), planting in rich soil (weakens the plant), and heavy pruning of old wood (stunts growth). In zones 6-7, protect plants with burlap wraps during harsh winters, or grow in containers you can move to an unheated garage.
Harvesting
Begin harvesting rosemary once plants are established and showing vigorous new growth, typically 90-120 days after planting. The best indicator of readiness is when stems are producing fresh, bright green needle-like leaves that spring back when gently pressed.
Harvest in the morning after dew has dried but before the heat of midday, when essential oils are most concentrated. Cut 4-6 inch sprigs from the tips of branches using sharp scissors or pruning shears — never tear or break stems as this can invite disease. Look for young, flexible stems rather than older woody ones, which have less flavor and tougher texture.
Perform the 'snap test' on stems: they should bend but snap cleanly when folded. If stems are too woody to snap easily, move to younger growth. You can harvest rosemary year-round in mild climates, but avoid heavy cutting during winter months when growth slows.
Always cut just above a leaf node or branching point to encourage bushier growth. Take no more than one-third of the plant at any single harvest to maintain plant health and vigor.
Storage & Preservation
Fresh rosemary keeps best stored like cut flowers — place stems in a glass of water and cover loosely with a plastic bag, then refrigerate. This method maintains freshness for 2-3 weeks. Alternatively, wrap sprigs in slightly damp paper towels and store in the refrigerator crisper drawer for up to 10 days.
For drying, hang small bundles in a warm, well-ventilated area away from direct sunlight. Properly dried rosemary retains its potency for up to a year when stored in airtight containers. Strip needles from stems once completely dry and brittle.
Freezing works exceptionally well for rosemary — simply wash and pat dry whole sprigs, then freeze in sealed bags for up to six months. Frozen rosemary can be used directly in cooking without thawing. For herb-infused oils, gently heat olive oil with fresh rosemary sprigs at low temperature for 2-3 hours, then strain. Infused oils should be refrigerated and used within one month for food safety.
History & Origin
Rosemary (Rosmarinus officinalis) traces its origins to the Mediterranean basin, where it has grown wild along rocky coastlines for thousands of years. The name derives from the Latin 'ros marinus,' meaning 'dew of the sea,' reflecting its natural habitat near coastal areas where morning dew provides much of its moisture.
Ancient civilizations revered rosemary for both culinary and medicinal purposes. Greeks and Romans considered it sacred, using it in religious ceremonies and believing it strengthened memory — students would wear rosemary garlands while studying. Egyptian pharaohs were buried with rosemary sprigs to ensure remembrance in the afterlife.
Monks cultivated rosemary in monastery gardens throughout medieval Europe, spreading its use across the continent. By the 14th century, it had become essential in European cuisine and folk medicine. The herb reached the Americas with Spanish and Portuguese colonists, thriving in similar Mediterranean climates like California.
Today's culinary rosemary varieties are selections from wild Mediterranean plants, chosen for their superior flavor, hardiness, or growth habits. While not technically heirloom varieties, some cultivars like 'Arp' and 'Hill Hardy' have been selected for specific traits over decades of cultivation.
Advantages
- +Extremely drought-tolerant once established, requiring minimal watering
- +Naturally pest and disease resistant with few serious problems
- +Provides year-round harvest in zones 8-10, continuous fresh herbs
- +Beautiful ornamental value with fragrant foliage and edible flowers
- +Attracts beneficial pollinators while repelling harmful insects
- +Requires virtually no fertilization, thrives in poor soils
- +Long-lived perennial that improves with age when properly sited
Considerations
- -Extremely sensitive to overwatering and poor drainage, prone to root rot
- -Cannot tolerate freezing temperatures below 20°F without protection
- -Slow to establish from cuttings, requires patience in first year
- -Becomes woody and less productive without regular pruning
- -Seeds are notoriously difficult to germinate and slow to develop
Companion Plants
Plant Together
Basil
Repels aphids and whiteflies, complementary water and soil requirements
Thyme
Similar Mediterranean growing conditions, both deter pests like cabbage worms
Sage
Shared preference for well-draining soil and full sun, mutual pest deterrence
Tomatoes
Rosemary repels tomato hornworms and whiteflies that damage tomatoes
Carrots
Rosemary deters carrot flies while carrots don't compete for nutrients
Beans
Beans fix nitrogen in soil while rosemary repels bean beetles
Cabbage
Rosemary repels cabbage moths, cabbage worms, and other brassica pests
Broccoli
Strong scent deters flea beetles and cabbage loopers that attack brassicas
Keep Apart
Cucumber
Rosemary's allelopathic compounds can stunt cucumber growth and development
Lettuce
Rosemary's strong oils and root secretions inhibit lettuce germination and growth
Pumpkin
Competition for space and rosemary's allelopathic effects reduce pumpkin yields
Nutrition Facts
Per 100g serving. % Daily Value based on 2,000 calorie diet. Source: USDA FoodData Central (FDC #173473)
Pests & Disease Resistance
Resistance
Generally disease resistant, good air circulation prevents fungal issues
Common Pests
Spider mites, aphids, scale insects
Diseases
Root rot, powdery mildew in humid conditions