Gadenin日本語Get the appThe year at a glance
Oregano is a perennial, so the work is not sowing and clearing but renewing: thin and divide in spring, cut hard twice in the growing season, take the main harvest as the buds swell, and then leave it alone through winter. Once a plant is established the whole year adds up to a few hours of work.
Everything below is written by stage rather than by month so it reads the same in either hemisphere. Where a season is named, take it from the plant and the weather in your own garden.
| Season | Main job | Watering | What to watch for |
|---|---|---|---|
| Late winter | Clear old debris from the crown | None | Crown rot from a wet winter |
| Early spring | Thin the woody stems, divide every two to three years | Once after dividing, then leave | First new shoots appearing from the base |
| Late spring | First hard cut, take cuttings, layer stems | Only in a dry spell | Aphids on soft tips |
| Early summer | Main harvest as flower buds swell, dry the crop | Deep soak then dry right out | Buds forming, do not miss the window |
| Midsummer | Let some flower for the bees, cut the rest | Rarely needed in the ground | Spider mite in hot still spells |
| Late summer | Second cut if the plant has budded again | Cut right back | Mildew in the crowded center |
| Autumn | Light tidy only, stop picking | Almost none | Soft late growth that will not harden |
| Winter | Leave the top growth on, keep pots dry | None | Standing water around the crown |
Spring: thin, divide, and resist feeding
As soon as new shoots show at the base, cut out about a third of the oldest woody stems right down to the crown. This opens the center to light and air and is the single most effective thing you can do to prevent mildew later. At the same time, remove any stems that died back over winter, which snap dry rather than bending.
This is also the moment to divide, every second or third year. Lift the clump, throw away the woody middle and replant the vigorous outer pieces. The one thing not to do in spring is spread compost or feed around the plant, however tired it looks. A division into fresh gritty soil achieves everything a feed would, without flattening the flavor.
- Clear the crown Pull away fallen leaves and dead material sitting against the base. Debris held against the crown through a damp spring is a common cause of rot.
- Thin, do not shear Take whole old stems out at the base rather than trimming everything to the same height. Shearing keeps the congestion and just makes it shorter.
- Take the first pickings once shoots are six inches Light picking from six inches (15 cm) encourages branching. Save the serious cutting for early summer.
Early summer: the cut that matters
Watch the shoot tips from late spring onwards. When tight green flower buds form but before any open, cut the whole plant back by half to two thirds on a dry morning. This is the highest oil content of the year and the batch to dry for the store cupboard. Miss it by three weeks and the same plant gives noticeably weaker material.
After that cut, water once and then leave the plant to dry out properly between waterings. Cut hard and kept lean, a healthy plant in a warm summer will produce a second flush and often a second set of buds before autumn.
Leave one plant, or one section of a large clump, to flower fully. Oregano in flower is one of the best nectar plants in the garden and brings in the hoverflies and parasitic wasps that keep aphids down everywhere else.
Late summer and autumn: stop early
Take a second hard cut in late summer only if the plant has grown enough to have set buds again. If it has not, leave it. Then stop picking entirely about a month before your first expected frost. Cutting after that point pushes out soft green growth that has no time to harden, and soft growth going into frost is the usual reason a plant fails over winter.
In autumn do nothing but the lightest tidy: pull off spent flower stems and any obviously dead material. Do not cut the plant down. The old top growth traps air and protects the crown, and you can cut it away in spring once the new shoots are visible.
- Cut watering right back As growth slows the plant uses very little. Continued summer watering in cool damp autumn weather is what starts crown rot.
- Move pots against a wall Somewhere sheltered from rain rather than somewhere warm. Wet is the danger in winter, not cold.
- Clear debris from under the plant Rust and mildew spores overwinter in fallen leaves at the base. A clean crown in autumn cuts next year's infection substantially.
Winter: keep it dry rather than warm
Established oregano is hardy well below freezing and needs no protection from cold in most gardens. What kills it is a wet winter, particularly in heavy soil or in a pot standing in a saucer, where the crown sits in cold water for weeks and rots. Raise pots on feet, tip out any saucer, and if the bed is heavy consider planting on a slight mound.
Do not water plants in the ground at all. Container plants need a small amount, perhaps once a month in a mild spell, only enough to stop the rootball becoming completely dust dry. Growth stops entirely in cold weather and a dormant plant that is watered as though it were growing will not be alive in spring.
First-year plants from cuttings or late divisions are the vulnerable ones. Overwinter these in a cold frame or against a sheltered wall for their first winter, then treat them as fully hardy afterwards.
The dates worth writing down
Four dates make up a useful oregano record: when the first new shoots appeared in spring, when flower buds first showed, when you made each hard cut, and how long the drying took. Bud timing is the important one, because it moves by two or three weeks between a warm year and a cool one and it decides the whole harvest.
Add the position of each plant and the year it was last divided. Divisions are due every two to three years and it is remarkably easy to lose track, then wonder why a plant that was excellent has gone woody and mild. A written division date removes the guesswork entirely.