How to grow oregano — Greek vs Italian vs Mexican types

How to grow oregano — Greek vs Italian vs Mexican types

Oregano is the herb most often grown without realising there are three completely different plants sold under that name. Greek oregano is the high-flavour cooking standard. Italian oregano is a milder hybrid. Mexican oregano is not even in the same plant family — it belongs to the verbena family rather than the mint family — and its flavour profile is genuinely different. Pick the right one for what you cook, plant in lean dry soil with full sun, and you have a perennial that delivers for 4-5 years before needing replacement.

Track your oregano harvests in Growli: Add the variety to the Growli app and the morning briefing tells you when to cut stems and when to give the post-flower haircut.

Oregano varieties — the three types

This is the most common cause of disappointing oregano flavour: people grow ornamental Origanum vulgare (the wild oregano common in UK gardens) and find it bland. The cooking flavour comes from Greek oregano specifically.

Greek oregano (Origanum vulgare subsp. hirtum) is the cooking-grade oregano. It carries the high carvacrol content (typically 60-80%+ of essential oil) that defines true Mediterranean oregano flavour. Buy a plant labelled "Greek oregano" specifically — generic supermarket "oregano" pots are usually milder common oregano.

Italian oregano (Origanum × majoricum) is a hybrid between Greek oregano and sweet marjoram (Origanum majorana). Milder than Greek, sweeter than marjoram. Useful for mixed herb blends where strong oregano flavour would overpower other ingredients.

Common oregano / wild marjoram (Origanum vulgare without the hirtum designation) is the species found across European meadows. Pretty pink-purple flowers loved by bees, but flavour is mild to nearly absent. Grow it for pollinators or ornament, not for cooking.

Mexican oregano (Lippia graveolens) is a different genus entirely — botanically a verbena, not a mint. It contains thymol and eugenol rather than carvacrol, producing a citrusy, slightly pungent flavour very different from Mediterranean oregano. It is the right oregano for Mexican and Latin American cooking and a poor substitute in Italian tomato sauces.

UK retailers — variety availability

• Sarah Raven, Crocus, RHS Plants, Hayloft carry Greek oregano specifically labelled, plus Italian oregano in some lines.
• Garden centres often stock generic "oregano" or "wild marjoram" — confirm the cultivar before buying for cooking.

US retailers — variety availability

• Burpee, Johnny's Selected Seeds, Mountain Valley Growers, Richters Herbs carry Greek oregano, Italian oregano, and Mexican oregano.
• For Mexican oregano specifically, look for Lippia graveolens in the listing — some US sellers also sell unrelated "Mexican oregano" species (Poliomintha longiflora) which is genuinely different again.

Soil — drainage matters

Like rosemary and thyme, oregano evolved on dry stony Mediterranean hillsides:

• Texture: Free-draining. Heavy clay kills oregano over winter from root rot.
• Amendments: Mix 30% horticultural grit, perlite, or sharp sand into potting compost.
• pH: Slightly alkaline, 6.5-7.5.
• Fertility: Lean. Rich soil produces lush soft growth with weak flavour. Skip the compost when planting and skip the feeding routine.

In heavy clay gardens, grow oregano in a container with gritty mix, or in a raised bed.

Sun

Full sun: 6+ hours of direct sun per day. South-facing position. Oregano in shade produces leggy stems with weak flavour — the essential oil concentration depends on sunlight.

In hot southern US summers (zones 9-10) light afternoon shade is acceptable but the plant is genuinely heat-tolerant.

Planting

Greek oregano is rarely grown from seed (true-to-type seed is hard to find) — most named varieties are propagated from cuttings or division. Italian oregano is a hybrid and does not come true from seed.

From transplant (recommended):

1. Plant after the last frost — late April/May in UK and US south, late May/early June further north.
2. Space plants 30cm apart.
3. Set the crown level with the soil surface.
4. Water in once. Leave alone for a week.

From seed (common oregano only):

1. Surface-sow indoors 8-10 weeks before last frost.
2. Cover seeds with vermiculite — oregano needs light to germinate.
3. Keep at 20-22°C; germination in 7-14 days.
4. Pot up to 4-inch containers when seedlings have true leaves.
5. Note: seed-grown plants vary in flavour. For Greek oregano flavour, always start with a named cultivar transplant.

From cutting:

Take 3-inch softwood cuttings in late spring. Strip lower leaves, dip in rooting hormone, pot up in a 70/30 grit-to-potting-mix blend. Roots in 4-6 weeks.

From division:

Established Greek and Italian oregano can be split in early spring or autumn. Lift the clump, slice with a spade, replant each piece.

Watering

Oregano is drought-tolerant once established. Overwatering causes root rot.

• First year: Water weekly during dry spells.
• Established in-ground plants: Rainfall is usually enough. Water during prolonged drought.
• Container oregano: Water when the soil is completely dry, typically every 5-7 days in summer.

A drooping established oregano is more often overwatered than thirsty. Check the soil before adding water.

Pruning — the post-flower haircut

Oregano is a perennial sub-shrub that becomes woody and leggy without annual pruning:

1. Wait until after summer flowering ends (typically July-August).
2. With sharp scissors, shear the plant back by about a third to a half.
3. Cut into green growth, just above leaf nodes — like pruning basil.
4. The plant rebranches within 2-3 weeks and often produces a second flush of fresh leaves before autumn.

This single annual shearing extends productive life from 2-3 years to 4-5 years.

For culinary use, snip stems above leaf nodes whenever needed throughout the season. Take roughly the top third of stems each time; cut every 2-3 weeks during active growth.

Winter care

Greek oregano is hardy across USDA zones 5-10 and most of the UK. The plant dies back partially in winter and resprouts from the base in spring.

• In-ground plants: No protection needed in zones 5-9. Cut woody stems back to 5cm above soil in late autumn.
• Container plants in cold zones: Move pots to a sheltered south-facing wall. Avoid heavy mulching on the crown — wet mulch causes rot.
• Mexican oregano is much less hardy — only zones 9-11. Grow in a container and overwinter indoors in cooler climates.

Replace plants every 4-5 years as they become woody and unproductive.

Pests and problems

Oregano is one of the most pest-resistant culinary herbs.

• Root rot — soggy soil; the plant wilts, blackens at the base. Improve drainage immediately.
• Spider mites on indoor oregano — fine webbing, stippled leaves. Increase humidity, rinse foliage. See houseplant pests.
• Aphids on new growth — uncommon, but possible on stressed plants. See aphids on plants.
• Powdery mildew — humid weather, dense growth. Thin the plant, improve air circulation.

Pet safety — oregano and pets

The ASPCA classifies oregano (Origanum vulgare) as toxic to dogs, cats, and horses. The toxic principle is described as gastrointestinal irritants; clinical signs are mild vomiting and diarrhoea with large ingestions.

For practical purposes: a pet nibbling a few oregano leaves in the garden is unlikely to be in serious danger, but pets should be discouraged from consistently grazing the plant. Cooking-quantity oregano sprinkled in pet food is generally low-risk but unnecessary. Concentrated oregano essential oil is significantly more dangerous — keep it away from pets entirely.

Mexican oregano (Lippia graveolens) is not on the ASPCA list but as a Lippia, it should be treated cautiously around pets; the safety profile is not well established.

If a pet ingests a large quantity and shows GI symptoms, call the ASPCA Animal Poison Control Center at (888) 426-4435 or contact your vet.

Companion planting

Oregano is a useful companion in vegetable and ornamental beds:

• Brassicas (cabbage, broccoli, kale, cauliflower) — repels cabbage moth and cabbage looper.
• Tomatoes and peppers — culinary companions in the kitchen and the garden; oregano is a low-growing ground cover under taller fruiting plants.
• Cucumbers and squash — repels several cucumber beetles when planted in the same bed.
• Roses — deters aphids and contributes to a Mediterranean-style ornamental bed.

Good neighbours for oregano itself: thyme, rosemary, sage, lavender — all share lean dry soil and full sun. Avoid moisture-loving neighbours (mint, basil, parsley) which need different watering schedules.

Letting some of the plant flower attracts honey bees, bumble bees, and hoverflies in large numbers — oregano flowers are one of the most pollinator-magnetic plants you can include in a kitchen garden. The trade-off is reduced leaf production while flowering; keep some plants flowering for pollinators and shear others post-flower for continued harvest.

Culinary use

Oregano pairs particularly well with:

• Greek oregano: Tomato sauces, pizza, Greek salad, roast lamb, marinades for grilled meats, the classic Italian-American "pizza herb" flavour.
• Italian oregano: Mixed herb blends, milder pasta sauces, herb butters.
• Mexican oregano: Chilli con carne, mole, beans, salsas, Tex-Mex marinades.

Oregano is one of the few herbs that genuinely improves with drying. The essential oils concentrate as the leaves dry, intensifying the flavour. Hang small bundles upside down in a dry airy room for 2-3 weeks, then strip leaves into a sealed jar. Dried Greek oregano keeps full flavour for about a year.

Related articles

• How to grow basil — the warm-season summer companion
• How to grow thyme — another Mediterranean perennial
• How to grow rosemary — same dry-sun conditions
• Types of herbs — Mediterranean vs moisture-loving vs annual
• Companion planting guide — oregano as a pest-deterrent companion

Reviewed and updated by the Growli editorial team. Pet-safety claims sourced from the ASPCA Animal Poison Control Center. For questions about anything here, open Growli and ask — or email hello@getgrowli.app.