When to plant
Plant in spring after last frost. Rosemary is a perennial in climates with mild winters (above -10°C). In colder zones, treat as an annual or grow in containers that come indoors for winter. It thrives in hot, dry summers.
Soil & site
Rosemary requires excellent drainage above all else — it originates from Mediterranean rocky hillsides and rots in wet soil. Plant in sandy, well-drained soil or raised beds. pH 6.0–7.0. Add grit or perlite to improve drainage. Rosemary thrives in poor, dry soil that would stress most plants.
Feeding
Minimal fertilizer required. Too much nitrogen produces fast, lush growth with less aromatic essential oil. A single application of balanced fertilizer in spring is usually sufficient. In containers, a slow-release granule once a season works well.
Common problems
Root rot from overwatering (the main killer of rosemary). Powdery mildew in humid conditions — improve air flow. Spittlebugs (frothy white masses on stems) — blast off with water. In containers, watch for root-bound plants which dry out rapidly.
When to harvest
Rosemary can be harvested year-round once the plant is established (at least 30 cm tall). The most aromatic sprigs are young, soft, green stems from the current season's growth. Avoid the hard, woody older stems.
How to harvest
Cut 10–15 cm sprigs from the tips of branches with clean scissors or pruners. Never remove more than one-third of the plant at once. Regular trimming keeps rosemary bushy rather than leggy. Always cut to just above a leaf node.
Storage & use
Fresh rosemary wrapped in a damp paper towel keeps in the refrigerator for 2–3 weeks. To dry: hang bunches upside down for 2–3 weeks in a warm, ventilated spot. Dried rosemary retains strong flavour for up to 3 years stored in an airtight container away from light.
Useful for growing rosemary
A few things that make this one easier — chosen for this plant, not a generic list.
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