Gadenin日本語Get the appLate winter to early spring: do very little
Peonies break dormancy late. Bare soil where you know a peony is planted, weeks after everything else in the border has started, is normal and not a sign of failure. Resist the urge to dig around and check. The crown is an inch or two down and the eyes are easily damaged by a fork.
The work at this stage is clearing rather than growing. Make sure last year's stems and leaves have gone; if they were left over winter, take them off now and remove them from the garden, because they carry the spores of peony wilt straight onto the emerging shoots. Spread a bucket of well rotted compost or a light dressing of balanced fertilizer in a ring around the plant, keeping it clear of the crown itself.
When the red shoots do appear, protect them from slugs and snails for the few weeks they are soft, and mark the plant's outline so it does not get trodden on or planted over.
Spring: the two jobs that decide the display
The first job is support, and it has a narrow window. When shoots reach 8 to 12 in (20 to 30 cm) and the buds are still hard green peas, put the ring or the stakes and string in place. Do it then and the foliage grows up through and hides it. Do it later and you are wrestling arched, brittle stems carrying buds, which is how stems get snapped by the gardener rather than the weather.
The second is watching the stem bases. Cool wet springs bring peony wilt, which shows as a stem wilting from the top while its base turns brown or black and soft. Cut affected stems out below soil level the day you see them, disinfect the blade, and bin the material. This is the one moment in the year when prompt action makes a real difference.
Water deeply at the base in a dry spring, since the plant is building both this year's flowers and next year's buds. Disbud if you want fewer, larger flowers: remove the small side buds while they are pea sized for one large bloom per stem.
| Season | What the plant is doing | Your job |
|---|---|---|
| Late winter | Dormant, crown just below the surface | Clear all old stems and leaves, dress with compost around the crown |
| Early spring | Red shoots emerging, very late | Protect from slugs, mark the position, keep the fork away |
| Mid spring | Shoots 8 to 12 in (20 to 30 cm), buds forming | Install supports now, start weekly checks for wilt at stem bases |
| Late spring | Buds swelling, ants feeding on them | Disbud if wanted, water deeply in dry spells, ignore the ants |
| Flowering | Short display of one to two weeks | Cut for the vase sparingly, keep water off the flowers |
| Early summer | Petals dropping | Deadhead to a strong leaf, leave every leaf standing |
| Mid to late summer | Building next year's flower buds | Water only in drought, no feeding, no cutting back |
| Autumn | Foliage dying back, roots still growing | Best season to plant or, if you must, divide |
| After frost | Fully dormant | Cut all stems to ground level and remove every scrap of debris |
Flowering and the long summer afterwards
Flowering itself is brief, often only one to two weeks on a single plant. Cut stems for the vase at the soft marshmallow stage, when the bud gives slightly under a squeeze but has not opened, and take no more than a third to a half of the stems from an established clump and none at all from a plant in its first two years.
When the petals fall, cut the spent flower off above the first strong leaf to stop seed set, and stop there. Everything green stays until frost. Through the summer the leaves are manufacturing next spring's flower buds, which are formed and packed away in late summer long before you would guess. A peony stripped of foliage in midsummer, by the pruners or by disease, has no flowers in it for next year.
Summer care is mostly restraint: no feeding, watering only in real drought, hand weeding rather than hoeing, and mulch kept off the crown. Successive years of mulch heaped over a peony bury it as surely as bad planting and quietly stop it flowering.
Autumn, winter, and the notes that carry over
Autumn is the planting and moving season. If a peony must be relocated, or a leafy flowerless plant needs its crown reset to the correct 1 to 2 in (2.5 to 5 cm) depth, early autumn is the only sensible time, and you should expect two to three flowerless years afterwards regardless. Otherwise leave established plants entirely alone.
After frost has killed the foliage, cut every stem to ground level and remove the debris from the garden. This is the most effective disease control in the peony year. Then leave the crown bare. Peonies need winter cold to flower and heaping protective material over the crown both insulates it from the chilling it requires and gradually buries the eyes.
Across the year, four notes are worth more than everything else you could record: the planting depth measured to the topmost eye, the date the shoots first appeared, the date the first flower opened, and the date you installed the supports. Together they tell you whether a poor year was weather, immaturity, depth or simply being three weeks late with a ring of string, and no amount of remembering will substitute for having written them down.