Greek oregano

Sun

Full sun; tolerates light afternoon shade in very hot climates, but deep shade weakens growth and flavour.

Water

Low once established. Water young plants regularly, then let the soil dry between thorough waterings; avoid persistently wet roots.

Soil

Well-drained sandy, gravelly or loamy soil, preferably neutral to alkaline. Tolerates lean soil; heavy clay needs improved drainage or a raised bed.

Height

1-2 ft (0.3-0.6 m), including flower stems

Spread

1-2 ft (0.3-0.6 m), spreading farther over time

Flowers

Small white flowers in clustered heads from midsummer into early autumn.

Foliage

Small, opposite, oval green leaves with fine hairs and a strong oregano scent. Dies back in cold winters but may retain some foliage in mild climates.

Growth

Moderate

Care needed

Low

• Pollinators
• Deer resistant
• Drought tolerant
• Heat tolerant
• Low allergen
• Fragrant
• Edible

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Easy

Toughness

Very tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1 ft (0.3 m)

2. After 1 year

   1.1 ft (0.35 m)

3. After 2 years

   1.3 ft (0.4 m)

4. After 3 years

   1.5 ft (0.45 m)

   full size

About 3 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Toxic

In the garden

Spreads vigorously: plan to contain it.

Growth rate

Moderate

• Water new plants when the root zone starts to dry; reduce watering once they are established.
• Avoid rich feeding; apply a little compost in spring only if growth is weak.
• Use a thin gravel mulch rather than moisture-holding mulch around the crown.
• Keep containers freely draining and empty saucers after watering.
• Divide crowded or woody clumps every three to four years in spring.

Pruning. In early spring, remove dead stems and trim back to healthy new growth. After flowering, shear lightly to encourage fresh leaves and remove seed heads if you want to limit self-seeding.

Pick leaves and tender shoot tips once the plant is well established and growing strongly; their flavour is usually strongest just before flowering. Cut above a pair of leaves, taking no more than about one-third of the leafy growth at once, and use fresh or dry in small bundles in an airy, shaded place.

Early spring

Remove dead stems and check that winter moisture has not rotted the crown.

Spring

Plant in well-drained soil, or divide established clumps as new growth begins.

Late spring

Pinch shoot tips to encourage branching and begin light harvesting.

Early summer

Harvest leafy stems just before flowering for drying.

Summer

Leave some flowers for insects; water established plants only during prolonged dry spells.

Late summer

Trim spent flowers to encourage fresh foliage and reduce self-seeding.

Autumn

Clear fallen leaves from the crown and move pots out of persistent winter rain.

• Edge a sunny kitchen garden or raised bed where the leaves are easy to harvest.
• Combine with thyme, sage and lavender in a gravel herb garden with shared drainage needs.
• Use in pots beside a sunny seating area, where brushing the leaves releases their scent.
• Plant in small groups along a sunny border to provide a low leafy layer beneath taller perennials.

Garden styles it suits: Mediterranean, Potager (kitchen garden), Herb parterre, Dry gravel garden, Edible landscape and Sensory garden.

Plant it with: Thyme, Common sage, Lavender, Rosemary and Winter savory.

Wildlife: Flowers attract bees, butterflies and other nectar-feeding insects. Leave part of the plant unharvested so it can flower.

• Root and crown rot in wet soil: improve drainage, reduce watering and replace badly affected plants in a drier position.
• Aphids on soft shoots: rinse off with water and avoid excessive nitrogen feeding.
• Spider mites in hot, dry, sheltered conditions: rinse leaf undersides and improve airflow around container plants.
• Leggy growth and weak flavour in shade: move to a sunnier position and trim back lightly to encourage branching.

Oregano is considered toxic to cats, dogs and horses if eaten, chiefly because of its aromatic oils; foliage may cause digestive upset, and concentrated essential oil poses a greater risk. Leaves are not known to be toxic to people in normal culinary amounts, though allergies are possible.

• Common oregano (Origanum vulgare)

  Typical common oregano usually has pink to purple flowers and often a milder scent; Greek oregano normally has white flowers and more strongly aromatic, hairy leaves.

• Sweet marjoram (Origanum majorana)

  Has softer, greyer leaves, a sweeter scent and compact, knot-like flower clusters; it is much less winter-hardy.

• Mexican oregano (Lippia graveolens)

  An unrelated, frost-tender woody shrub with larger, rougher, toothed leaves rather than Greek oregano's small, low-growing leafy shoots.

The epithet hirtum means hairy, referring to the plant's hairs, while Greek oregano distinguishes this strongly flavoured Mediterranean form from other oreganos.

Propagation. Divide established clumps in spring or take softwood cuttings in late spring to early summer. Seed is possible, but seedlings may vary in flavour, especially where other oregano plants grow nearby.

Accepted botanical name

Origanum vulgare hirtum

Sources: GBIF (CC BY 4.0). The care and design notes are LandscapeGPT's own.