🌲 Rosemary

Rosemary grows in very well-drained, aerated soil; it performs best in sandy or gravelly loam and tolerates relatively poor substrates of low to moderate fertility. Avoid heavy clay and any waterlogged conditions (use raised beds or amend with coarse sand to improve drainage). A neutral to slightly alkaline pH is preferable (approx. 6.0-8.0). In containers, use a mixture of draining potting soil cut with mineral materials (e.g. gravel, perlite or pumice) and ensure that drainage holes are not blocked.

Rosemary (Salvia rosmarinus) is best propagated from cuttings, but can also be grown from seed. From seed : - Timing: Sow seeds indoors 6 to 10 weeks before the last expected frost. Direct sowing outdoors is only possible when the risk of frost has passed and the soil is warm. - Medium: Use a sterile, non-draining starter mix (granulated/sand). Rosemary does not tolerate waterlogged environments. - Sowing: Sow very superficially (press into surface or lightly cover with a thin layer of mixture/vermiculite). Light may encourage germination. - Temperature: Keep warm, around 15-21°C (60-70°F), with even humidity (moist, not wet). - Germination: Slow and often irregular, may take several weeks or more. Ensure good air circulation and avoid over-watering to reduce melting. - Potting: When seedlings have true leaves and are large enough to handle, transplant them into individual pots with a granular, well-drained mix. Planting : - Hardening off: Acclimatize seedlings to outdoor conditions for 7 to 10 days before transplanting. - Location: Full sun (at least 6-8 hours) and well-drained, sandy/rocky soil; neutral to slightly alkaline soils suit it well. - Spacing: Space plants approximately 45-60 cm (18-24 in) apart (wider for vigorous cultivars). - Care: Water to establish the plant, then allow the surface to dry between waterings; avoid heavy, poorly drained sites, especially in winter. From cuttings (recommended): - Take 7-10 cm cuttings of soft or semi-mature wood from non-flowering shoots, remove the lower leaves and root in a non-draining mix under bright light and moderate humidity. Transplant once the plant is fully rooted and growing.

Rosemary (Salvia rosmarinus) feeds little and generally needs little or no fertilizer when grown outdoors in reasonably fertile, well-drained soil. Excessive fertilization, especially of high nitrogen content, promotes limp, lush growth with a weaker aroma and can reduce hardiness. Plants in the ground: Apply a small amount of compost or well-decomposed organic matter in spring if growth is weak; otherwise, avoid routine feeding. If fertilizer is used, apply sparingly in spring only (a light coat of a balanced general fertilizer), and do not fertilize from late summer to late winter. Potted plants: Nutrients escape from pots, so fertilize sparingly during active growth. Use either a controlled-release balanced fertilizer at label rates in spring, or a diluted liquid balanced fertilizer (about half the dose) every 4 to 6 weeks from spring to midsummer. Stop feeding in late summer to allow growth to harden off before the onset of cold weather. General advice: Ensure excellent drainage; do not fertilize drought-stressed or newly transplanted plants until they are established; if using compost, avoid heavy, moisture-retaining amendments. If soil analysis reveals sufficient fertility, do not apply fertilizers and opt for light pruning and good sun exposure.

Use a light, well-drained mulch to keep the crown dry. In most cases, prefer mineral mulches (gravel, small pebbles, coarse sand) around rosemary to reduce splashing, suppress weeds and avoid trapping moisture against the stems. If using organic mulch (bark/compost), apply only a thin layer and keep it several centimetres from the base of the plant to prevent crown and stem rot. In cold-winter climates, after the ground has frozen, add a loose, airy winter mulch (straw or conifer branches, for example) to insulate the roots and reduce freeze-thaw damage, then remove it in early spring when temperatures warm up and growth resumes.

Traditionally used as an herbal medicinal product for the symptomatic relief of mild digestive disorders (e.g. dyspepsia, bloating/flatulence) when taken orally, and for the temporary relief of minor muscle and joint pain when applied to the skin (as an oil/liniment). Rosemary leaf preparations also contain phenolic diterpenes (carnosic acid, carnosol) and rosmarinic acid, whose antioxidant and anti-inflammatory activity has been demonstrated in pharmacological studies.

Regularly harvest the tips of young shoots to encourage bushy growth. Prune lightly after flowering (or in early spring in mild climates) to maintain shape: reduce the current season's green growth by about a third, cutting just above the leafy nodes. Avoid cutting into old, leafless wood, as rosemary often has difficulty regrowing on bare, woody stems. If necessary, remove dead, damaged or crossing branches, and thin out crowded stems to improve air circulation. In regions with cold winters, avoid heavy pruning in late summer or autumn, so that new shoots can harden off before the frosts.