Thyme & Oregano
Thymus / Origanum spp.
Mediterranean perennials that fail from kindness. Poor dry soil is what they want.

Do not be kind to them
These are dry hillside plants from the Mediterranean. Rich soil, heavy feeding and generous watering produce lush growth with weak flavour and plants that rot over winter. Lean, gritty, sharply drained soil - even poor soil - produces the highest essential oil content and the toughest plants. This is the single most common mistake with both.
Drainage above all
Winter wet, not winter cold, is what kills them here. Plant on a slope, in a raised bed, in a container, or amend heavily with grit. A gravel mulch around the crown rather than an organic one keeps the base dry and reduces rot considerably.
Buy plants or take cuttings
Both are slow and erratic from seed, and seed-grown oregano in particular is often the bland ornamental type rather than true Greek oregano (Origanum vulgare subsp. hirtum). Buy a plant you have tasted, then propagate it by cuttings or division.
Harvest before flowering
Essential oil concentration peaks just as flower buds form and before they open. Cut then for drying. You can harvest lightly all season, but that pre-flowering cut is the one worth preserving.
Cut back, but not into old wood
Shear plants back by about a third after flowering to keep them compact. Do not cut hard into bare woody stems, which often will not resprout - unlike many shrubs, thyme and oregano are reluctant to break from old wood.
Renew every few years
Both go woody, sparse and unproductive after three to five years. Take cuttings, divide the clump, or layer a low branch by pegging it to the soil, and start replacements before the parent declines.
Pests
Almost none - the aromatic oils are the plant's defence, and both are usefully deer-resistant. Root rot from wet soil is the real threat. Spider mites occasionally appear on plants under drought stress indoors.
Drying and storage
These are among the few herbs that genuinely improve, or at least hold up, dried - dried oregano is arguably better than fresh for many dishes. Hang small bunches somewhere dark and airy, then strip the leaves and store airtight away from light. They keep their flavour for about a year.
- Hardiness
- Zone 5-9
- Spacing
- 12-18 in
- Sun
- Full
- pH
- 6.0-8.0
- Water
- Low, drought tolerant
- Life
- Perennial, 3-5 yrs
- Soil
- Lean, gritty, sharp drainage
- Harvest
- Before flowering