Seed to Harvest Herb Guide
How to grow rosemary
A practical guide to starting slow rosemary seed, building a woody aromatic shrub, protecting drainage and winter growth, and harvesting tender sprigs year-round.
Before you begin
Rosemary needs patience first and drainage forever.
Rosemary (Salvia rosmarinus) is an evergreen Mediterranean shrub grown for resinous culinary leaves, fragrance, potpourri, and pale blue pollinator flowers. Seedlings vary and develop slowly.
Rosemary at a glance
The path from slow seed to a branching evergreen shrub
Select any milestone to jump directly to its full instructions.
Establishment
Start more seed than you need
Rosemary germination is naturally slow and uneven, so extra cells improve the odds of selecting vigorous plants.
Sow indoors early
Start 10–12 weeks before the last frost. Press seed onto moist mix and cover lightly, no more than 1/4 inch.
- Maintain about 65–75°F.
- Expect sprouts in 14–28+ days.
- Use a free-draining seed mix.
Grow compact seedlings
Provide strong light and airflow as soon as sprouts appear, watering carefully around tiny roots.
Plant after frost
Harden for 7–10 days, then transplant into full sun and sharply drained soil 18–36 inches apart.
- Keep the crown at soil level.
- Avoid heavy wet clay.
- Water deeply after planting.
Ongoing care
Keep rosemary sunny, airy, and slightly lean
Once established, rosemary prefers drying between deep waterings and needs little fertilizer.
Maximize sun
Give 6–8 hours of direct light outdoors or the brightest possible winter window.
Water after drying
Water deeply when the upper 1–2 inches dry; never leave containers standing in water.
Prune green stems
Shorten leafy tips to shape plants, avoiding severe cuts into bare old wood.
Overwinter cool
Keep tender plants bright, frost-free, and away from hot dry indoor air.
Growth checkpoints
Track emergence, branching, wood, and bloom.
Stem color and texture show where pruning and harvest cuts belong.
Seedlings emerge
Fine upright shoots appear unevenly across the tray.
Branching begins
Pinched green tips produce compact side shoots.
Base becomes woody
Lower stems harden while young tips remain flexible.
Blue flowers open
Small blooms attract early pollinators in mild climates.
Text-only diagnostics
Diagnose rosemary problems early
Match the symptom, then open the card for prevention and the next practical action.
GerminationFew seedlings emergeMost cells remain empty after several weeks
Continue care for at least a month, maintain moderate warmth, and resow with fresh seed in free-draining mix.
Crown diseaseRoot rotStems wilt or brown while soil stays wet
Improve drainage, reduce watering, uncover the crown, and remove plants with soft decayed roots.
Indoor stressDry, dropping needlesLeaves crisp despite regular watering
Move away from heating vents, increase cool bright light, and water only after checking the root zone.
PestSpider mites or scaleLeaves stipple, web, or carry fixed bumps
Isolate indoor plants, rinse foliage, remove infested tips, and inspect stems repeatedly.
Sprig harvest
Cut flexible green tips above a leafy node
Light, frequent harvest shapes the shrub and supplies tender aromatic leaves without exposing bare wood.
- Choose: Select healthy nonwoody tips after dew dries, before or during light bloom.
- Cut: Snip above leafy growth and never remove more than one-third at once.
- Store: Use fresh, refrigerate briefly, freeze leaves, or dry sprigs in shade with airflow.
Urban Farmer’s rosemary offering
Grow classic common rosemary
This versatile aromatic herb supplies culinary sprigs, fragrance, potpourri material, and evergreen structure.
Questions herb gardeners ask
Rosemary growing FAQ
Quick answers for sowing, germination, drainage, containers, pruning, harvest, and winter care.
Is rosemary an annual or perennial?
Rosemary is a woody evergreen perennial, but it must be protected where winters exceed its cold tolerance.
When should rosemary seed be started?
Start indoors 10–12 weeks before the last expected frost.
How deep should rosemary seed be planted?
Press seed onto moist mix and cover lightly, no more than about 1/4 inch.
How long does rosemary take to germinate?
Seed often sprouts in 14–28 days, with later seedlings common.
Why is rosemary germination uneven?
Seed naturally varies in dormancy and vigor, so sow extra cells and keep trays longer.
How far apart should rosemary be planted?
Space upright plants about 18–36 inches apart according to mature size.
Does rosemary need full sun?
Yes. Full sun supports compact growth, strong aroma, and healthy overwintering.
Can rosemary grow in a container?
Yes. Use a substantial pot with excellent drainage and move it before severe freezes.
How often should rosemary be watered?
Water deeply after the upper 1–2 inches of soil dry; reduce frequency in winter.
When should rosemary be pruned?
Shape green growth in spring or after flowering, avoiding deep cuts into bare wood.
When should rosemary be harvested?
Harvest flexible green tips whenever plants are actively growing, before or during bloom.
How should rosemary be overwintered indoors?
Keep it cool, bright, frost-free, and away from heating vents, watering only after partial drying.
Ready to plant?
Grow aromatic rosemary from seed.
Start early for culinary sprigs, evergreen fragrance, and a long-lived Mediterranean herb.