Sweet marjoram

1. 1

   Confirm you have sweet marjoram, not oregano

   Three Origanum species are easily confused. Sweet marjoram (Origanum majorana): the herb on this page — tender (H1c–H3), sweet delicate flavour, small grey-green leaves, white/pink knot-like flower buds. The flavour is what makes it distinct. Oregano / wild marjoram (O. vulgare): hardy perennial (H4–H5), stronger flavour, the pizza herb — see separate oregano slug. Pot marjoram (O. onites): half-hardy semi-shrub, intermediate flavour, less common. Buy by Latin name from a reputable herb nursery to be sure.

2. 2

   Sow indoors in March or buy a young plant in May

   From seed (cheaper, slower): surface-sow on damp peat-free compost in February–March (needs light to germinate, don't cover). Keep at 18–21°C. Germinates in 14–21 days. Pot up individually when seedlings have 4 true leaves. From plant (faster): buy a 9 cm or 1 L plant from a herb nursery (Jekka's, Pepperpot, garden centre) in May. One plant is enough for a household.

3. 3

   Plant out after the last frost

   Plant outside only after the last frost — mid-May in southern England, late May–early June in the Midlands and north. Sweet marjoram is killed by even light frost. Full sun, well-drained or gritty soil, sheltered position. For perennial culture: grow in a pot that moves indoors over winter (see Step 7).

4. 4

   Don't feed, don't over-water

   Mediterranean origins: sweet marjoram flowers and flavours best in poor, dry conditions. No fertiliser. Water only when the soil/compost surface is dry — overwatering causes weak floppy growth and reduces flavour intensity. A gravel mulch around the base keeps weeds down without holding moisture.

5. 5

   Pinch out flower buds for continuous leaves

   The trade-off: flowers vs leaves. Once sweet marjoram starts flowering (the distinctive knot-like buds appear from June–July), leaf production slows and existing leaves get coarser. Pinch out flower buds as they form to keep the plant producing tender leaves for the kitchen. For seed-saving or wildlife: let some flowers open (bees enjoy them) — accept the trade with leaf quality.

6. 6

   Pick young shoots through summer

   Snip 10 cm tips of young growth — the plant branches and re-grows. Strongest flavour is on tender new shoots before any flowering. Use fresh — sweet marjoram dries less well than oregano (the volatile oils are softer and more delicate, so they fade with drying). For winter use: chop fresh leaves and freeze in ice cubes with olive oil.

7. 7

   Overwinter the plant indoors as a perennial (optional)

   The UK trick for year-round sweet marjoram. Grow in a 25 cm pot through summer. Before the first frost (mid-October in most of the UK), move the pot indoors to a cool but frost-free position: a porch, conservatory, unheated greenhouse, or bright kitchen windowsill. Water sparingly through winter (just enough to prevent total dry-out). Cut back hard in March, top-dress with fresh compost, return outdoors after last frost. A pot-grown marjoram can live 4–5 years this way.

8. 8

   Take cuttings as insurance in late summer

   Insurance against winter loss. In August–September, take 8 cm tip cuttings of soft new growth, strip lower leaves, push into gritty compost in a propagator (cool, light position). Roots form in 3–4 weeks. Overwinter the rooted cuttings on a kitchen windowsill or in an unheated greenhouse — by spring you have new young plants to replace the parent if it doesn't make it through.

Aromatic oils deter most pests; generally trouble-free.