How to Grow Rosemary

Growing guide

Overview

Rosemary is a woody, evergreen Mediterranean herb grown for its aromatic, needle-like leaves and compact shrub form. Growers love it because it is drought-tolerant, long-lived, and useful in the kitchen. It thrives in full sun and lean, very well-drained soil with low water once established.

Soil & planting prep

Plant rosemary in sandy or loamy soil that drains sharply; avoid heavy clay unless improved with coarse sand or fine grit. A pH around 6.0–7.5 is ideal. Space plants 18–24 inches apart and set transplants at the same depth they were growing in the nursery pot.

When to plant

Plant nursery transplants or rooted cuttings outdoors in spring after your last frost date, once the soil has warmed and nights are reliably above 45–50°F. Because rosemary is not frost-tolerant, wait until frost danger has passed and avoid cold, wet spring soil.

How to plant

1. Choose a site with full sun, at least 6 hours of direct light daily, and sharp drainage.
2. If your soil is heavy, mix in coarse sand or fine grit; do not add rich compost or manure.
3. Dig a hole as deep as the root ball and about twice as wide, spacing plants 18–24 inches apart.
4. Set the plant in the hole at the same depth it was growing in its pot, backfill, and firm lightly.
5. Water deeply right after planting, then let the top inch of soil dry out before watering again.

5 common mistakes to avoid

• Overwatering is the most common killer: rosemary roots rot in constantly moist soil, so let the top inch or two dry out before watering and use a fast-draining mix.
• Planting in shade or partial shade weakens growth and reduces the aromatic oils, so give it at least 6 hours of direct sun daily.
• Enriching the planting hole with manure or rich compost pushes soft, weak growth with less flavor; rosemary prefers lean, sandy or gritty soil.
• Leaving rosemary in wet soil through hard freeze-thaw cycles can kill it in cold-edge zones, so grow it in containers and move them indoors before frost or provide extremely sharp drainage.
• Never cutting it back leads to a woody, sparse plant; prune lightly after flowering or harvest tips regularly to keep it bushy.

Harvesting & storage

Begin harvesting once the plant is established and putting on strong new growth. Snip 4–6 inch sprigs from outer stems, cutting above a leaf node, and avoid cutting into old, leafless wood. Use fresh, or dry small bunches and store the leaves in an airtight jar away from light.

Companion planting

Good companions include beans, carrots, cabbage-family crops, and sage. Avoid planting it beside basil or other moisture-loving herbs that need consistently wetter soil than rosemary tolerates.

Growing in containers

Rosemary grows well in containers; use a pot at least 3 gallons with a drainage hole and a gritty, well-drained potting mix. In colder parts of its range, grow it in a container so you can move it to a bright, cool indoor spot before frost.

Pro tips

Plant in the sunniest most well-drained spot. Excellent in containers — bring indoors in winter in cold zones. Drought-tolerant once established. Avoid overwatering.