Gadenin日本語Get the appLate winter to early spring: look, do not cut
The temptation in late winter is to tidy a plant that looks brown and dead at the tips. Resist it. Lavender is often slow to show life, and cutting before you can see where the new shoots are coming from is how people take stems below the green and lose whole branches.
What is worth doing now is clearing. Pull out leaves and debris that have collected in the crown over winter, remove weeds growing up through the plant, top up gravel mulch, and check that nothing is dripping onto the plant. If a container plant has been sheltered, make sure it is not sitting in water and start moving it back into full light.
Spring: assess damage, plant, and leave the rest alone
Once new growth is visible, you can tell live from dead. Trim frost-browned tips back to just above the highest live leaves, and cut out any whole branch that is gray and brittle at the base, right back to healthy wood or to the ground. Do not attempt a general hard prune now; the shaping cut belongs in late summer.
Spring is the best planting season, especially where winters are hard. It is also the time to pot up rooted cuttings, to repot container plants into fresh gritty mix, and to lime the soil if a test showed it below about pH 6.5. Feeding, as always, is not on the list.
| Stage | Main job | The decision to make |
|---|---|---|
| Late winter | Clear debris from the crown | Do not cut anything yet |
| Spring, as growth starts | Trim frost damage, remove dead branches | Cut only above visible live leaves |
| Spring, after last frost | Plant new plants, pot on cuttings | Is the drainage right, or does the bed need raising |
| Early summer | Watch for the first flower spikes | Which group is this, based on when it opens |
| Flowering | Harvest for drying at the right moment | Cut when the lowest buds open, before full bloom |
| After each flush | Deadhead spent stalks | Take an inch (2 to 3 cm) of leaf with the stalk |
| Mid to late summer | Take semi-ripe cuttings | Use non-flowering side shoots only |
| Late summer | Shaping cut into a dome | Six weeks of growing weather left before frost |
| Autumn | Keep the base clear, lift pots off the ground | Bring tender types under cover before hard frost |
| Winter | Nothing except drainage checks | Is water sitting anywhere near the crown |
Early to mid summer: flowering and harvest
The order of flowering identifies your plants: the tufted French and Spanish types open first, often as spring warms, English lavender follows in early summer, and lavandins come last with their long stalks. Note those dates once and you never have to wonder again which pruning regime a plant needs.
For drying, cut when roughly the lowest third of the buds on the spike have opened and the rest are still closed. Cut too early and the buds do not hold color or scent; cut in full bloom and the flowers shatter off the stalk as they dry. Cut the stalks long, in the morning after the dew has gone, bundle them loosely and hang them upside down somewhere dark, dry and airy. For fresh flowers in a vase, cut at any point once the spike has color.
- Deadhead as soon as a flush fades Take the spent stalk plus about an inch (2 to 3 cm) of the leafy growth below it. On English lavender this often triggers a second, smaller flush in late summer.
- Leave some flowers if you want pollinators Lavender in flower is one of the best nectar sources in the garden. If bees matter more to you than a second flush, delay deadheading until the flowers are visibly over.
- Take cuttings while the plant is in growth Mid to late summer, from firm non-flowering side shoots, is the best window. Doing it now means rooted plants ready to grow on before winter.
Late summer: the one cut that matters
The shaping cut is the most important job of the lavender year. Cut the plant back into a tight dome, taking up to about a third off English lavender and proportionally less on the other groups, always stopping inside leafy growth with several pairs of leaves left below the cut.
Time it so there are at least six weeks of growing weather before your first expected frost. That lets the cut surfaces callus and any new growth harden. Cut too late and the plant enters winter with soft shoots that frost kills, and with open wounds that die-back gets into. If you have missed the window, skip the cut entirely and do it early next season; a year of shagginess is much better than a winter of damage.
If your late summer is unreliable, bring the shaping cut forward and combine it with deadheading in one operation immediately after the main flush. An early cut costs you a possible second flush; a late one can cost you the plant.
Autumn and winter: keep it dry
From autumn onwards the whole job is drainage. Clear fallen leaves out of the crown as they arrive rather than in one go in spring, keep gravel mulch topped up, and cut back anything that has flopped over the plant. Lift containers onto feet so water runs straight through, and empty and remove any saucers.
Tender types need moving before the first hard frost, not after it. Take French, Spanish and fringed lavenders into an unheated but bright frost-free space, watering only enough to stop the rootball going bone dry. Hardy English lavender in the ground needs no protection at all in most climates, and covering it with row cover for long spells does more harm than good by keeping it damp.
Finish the year by writing down the four dates that matter: first flowering, deadheading, the shaping cut, and the first hard frost. Compared against how the plants look next spring, that short list explains almost every success and every loss, and it is the difference between guessing and knowing when to cut.