Gadenin日本語Get the appThe shape of a wintersweet year
Almost everything this plant needs happens in a short period at the end of flowering, plus some watering if late summer turns dry. The rest of the calendar is deliberately empty, and resisting the urge to fill it is most of the skill.
| Season | What the plant is doing | What you do |
|---|---|---|
| Midwinter | Flowering on bare wood | Enjoy the scent; cut stems for indoors |
| Late winter | Last flowers fading, buds swelling | Prune now; clear seed pods; mulch |
| Spring | Leaves out, new shoots extending | One handful of balanced feed; weed the base |
| Early summer | Shoots growing hard | Nothing; water new plants only |
| Late summer | Flower buds forming on new wood | Water deeply in drought; take cuttings |
| Autumn | Leaves yellowing and falling | Nothing at all; do not prune |
Winter: the reason you grow it
The flowers open on bare twigs in the coldest weeks and keep coming for several weeks, individual blooms lasting well and the whole display running longer in a cold season than a mild one. Walk past on a still, damp morning or a mild evening, when the scent carries furthest. On a windy or bitterly dry day you may smell nothing even standing next to the plant; that is the weather, not the shrub.
This is also when you cut for the house. Take branches you would prune anyway, split the woody base, and stand them somewhere cool. Frost will make the open flowers translucent and limp; leave them, because they recover and go on scenting. Nothing else needs doing outdoors, and there is no watering, feeding or protection to think about.
Late winter into spring: your one working window
As the last flowers fade and before the new shoots get away, do the year's pruning: dead and crossing wood out, flowered shoots shortened by a third, the center thinned, no stubs left. On an old plant, take up to a third of the oldest stems out at the base. Snap off the dry seed pods and bin them, since the seeds are poisonous and the pods are exactly what a child picks up.
Follow the pruning with a mulch two inches (5 cm) deep over the root area, kept clear of the stems, and once the leaves are properly out, scatter a single handful of balanced granular fertilizer. Then clear grass and weeds from a two-foot (60 cm) circle around young plants. That is the whole spring job. Resist feeding more; extra nitrogen buys you long soft shoots and fewer flowers.
Summer: the season that decides next winter
Through early summer the shrub is a plain green background plant and needs nothing except water for anything planted within the last two years. Late summer is different and is the one time an established plant is worth watching. The flower buds for the coming winter form now on this year's shoots, and a long dry spell at this point measurably thins the following winter's display.
If four weeks pass without meaningful rain in the second half of summer, water deeply once a week with about five gallons (20 liters) poured slowly at the root run until the weather changes. This is also the moment to take semi-ripe cuttings, and a good time to check the older stems for scale insects while you can see what you are doing.
Do not shear or tidy the shrub in late summer, however untidy it looks. The buds are already on the wood, invisible, and cutting now removes them. Whatever needs shaping can wait until after flowering.
Autumn: deliberately do nothing
Wintersweet turns a soft yellow and drops its leaves, and the temptation when the border is being cut back is to give it a trim at the same time. Do not. An autumn cut removes the flower buds that have been sitting on the wood since summer and you will get almost nothing the following winter, with no way to undo it.
The only autumn tasks are honest ones: rake fallen leaves away from the base if the ground is heavy and stays wet, top up the mulch if it has thinned, and remove any stem that has clearly died so dieback does not spread. If you are layering, autumn after leaf fall is a good time to peg a low stem down.
The notes that make next year easier
Keep a short record against this plant and it becomes far easier to manage. Note the week the first flower opened and the week the last faded; the date you pruned and how much you removed; how dry the late summer was and how much you watered; and how heavily it flowered the following winter and whereabouts on the plant.
Two things fall out of those four lines. You learn whether your own late summer watering is doing anything, because the effect is visible in the next winter's flowering and nowhere else. And you learn whether your pruning is right, because heavy cuts and thin winters line up in the record even though they are eleven months apart. Also note once, permanently, whether the plant is grafted or seed-raised, and the spots around the garden from which you could actually smell it.