Gadenin日本語Get the appThe shape of the year
This is a spring plant that spends most of the year invisible or unremarkable, and the calendar reflects that. The flowering is over in three weeks in mid spring. The two months after it are when next year's display is built and are the only time watering matters. Late summer is the berry decision. Everything from autumn to late winter is dormancy, which is when all the digging, dividing and thinning has to happen because it is the only time the plant will tolerate it.
There is one job on this list that is not annual, and it is the important one. Every four or five years the mat becomes congested and flowering falls away, and it has to be lifted and thinned. Skipping it does not kill the plant, it just quietly converts a flowering patch into a green carpet over about three seasons, which is why so many long-established patches never flower.
| Season | Plant stage | Main job | Watch for |
|---|---|---|---|
| Late winter | Dormant, pips beginning to swell | Clear all debris off the crown, mulch, feed | Slug shelter under old leaves |
| Early spring | Paired leaves pushing through, rolled tight | Slug watch on new plantings | Shoots grazed off in the first mild damp nights |
| Mid spring | Flower spikes arching out of the leaf pairs | Cut a few for the house, count the spikes | Vase water left where children or pets reach it |
| Late spring | Bells browning, leaves at full size | Deadhead if you want no berries, feed | A dry spring cutting the display short |
| Early summer | Leaves working, runners extending | Water weekly if rainless, weed through the mat | Perennial weeds coming up inside the patch |
| Midsummer | Green berries swelling, leaf margins browning | Cut the boundary line, pull escaped runners | Drought in containers and first-year plantings |
| Late summer | Berries turning coral red, foliage yellowing | Remove berries if children or animals use the garden | Notched leaf edges on pots, meaning vine weevil |
| Autumn | Foliage collapsing, then dormant | Rake all dead leaves off, divide and thin, plant pips | Waterlogged ground going into winter |
Late winter and early spring: fifteen minutes that set up the year
The patch is invisible now and this is the easiest work to skip. Clear every scrap of dead leaf and collapsed mulch off the crowns and take it off the bed. That debris is where slugs overwinter and where gray mold spores sit waiting for the new foliage, and removing it is worth more than anything you can spray later in the season.
Then feed and mulch in one pass: a handful of balanced general fertilizer per square yard scattered over the surface, and an inch (2.5 cm) of leaf mold or garden compost laid straight over the top. Do it while the ground is still wet from winter. The rhizomes will run upward into that mulch, which is how an established patch keeps its roots in fresh material year after year without you ever digging it, and it is also the plant's insurance against a dry summer.
As the leaves come through in early spring, they emerge as tightly rolled pairs and are at their most vulnerable to slugs. On an established mat this is cosmetic. On anything planted in the last twelve months it matters, so go out with a torch on the first few mild damp evenings.
Mid spring to early summer: the flowers, then the part that counts
Flowering lasts two to three weeks and the scent carries much further than the flower is visible, which is worth remembering when you position a patch. Cut a few stems for the house by pulling rather than cutting, taking hold low down and drawing the stem out of the sheath; it comes away cleanly and lasts better than a cut stem. Tip the vase water down an outside drain afterwards, because cut stems leach the same cardiac compounds into the water and the jug is genuinely dangerous.
- Count the flower spikes in a fixed square yard Mark the same square each year from a wall or a post. The count is the only early warning you get of congestion, and it falls a full year before the display looks obviously thin. When it has roughly halved, book the thinning for autumn.
- Deadhead as the bells brown, if berries are a problem Snap or cut the flower stems off at the base while the berries are still green or absent. This is a safety job rather than a horticultural one, and it is far easier now than picking bright red berries out of collapsing foliage in late summer.
- Feed straight after flowering A second handful of balanced fertilizer per square yard, watered in, arrives exactly when the leaves are provisioning next year's pips. On a patch competing with shrub roots this feed is worth more than the late winter one.
- Water weekly through the six weeks after flowering One gallon (4.5 liters) per square yard in any week without real rain, poured slowly at soil level. Keeping the leaves working a few weeks longer is the single most effective thing you can do for next spring's flower count.
- Weed through the mat while the foliage is upright Bindweed, brambles, ground elder and tree seedlings are visible and traceable now. Leave them until the leaves flop in late summer and you will be feeling about in a mat of poisonous foliage to find the base of them.
- Leave every leaf on the plant No tidying, no cutting back after flowering, no mowing close enough to clip the edges. The foliage is the plant's entire manufacturing capacity until it dies back on its own, and removing it costs you next spring outright.
Midsummer to autumn: boundaries, berries and the dormant-season work
Midsummer is when the mat's outline is clearest and when you should walk the edge. Push a spade in vertically along the line you want to hold and pull the escaped runners out from the outside. Five minutes once a year keeps a patch exactly where it is; three years of not doing it means an excavation. If the patch is anywhere near plants you value, this is not optional maintenance.
Late summer brings the berry decision. Anything pollinated turns coral red and every part of it is poisonous, so if children or animals use the garden this is the week to go out with gloves and a bucket and take them off. The timing shifts by a fortnight or more between a cool year and a warm one, which is why it is worth writing the date down. Leaf margins browning at this point are normal in dry shade and mean nothing; the plant is simply winding down as a woodland floor plant does.
Once the foliage has properly collapsed in autumn, rake it all off the bed. Then, if the flower count told you the patch is congested, this is the window for the real job: lift about half the mat in blocks, wash the soil off, sort the fat blunt flowering pips from the thin pointed ones, replant the good ones at four to six inches (10-15 cm) apart with the tips half an inch (1 cm) under the surface, and fork leaf mold into the gaps. The thinned patch usually flowers better the following spring than it has in years.
The four notes that make next year easier
This plant asks you to make slow judgements from invisible evidence, so a handful of dated lines is worth more than it would be on a plant with a dramatic season. Keep four things, all of them a single line each.
The flower spike count in a fixed square yard, taken the same week each spring, which tells you when to thin. The date the first bell opened, which puts a bad year in context. The date the leaves finally collapsed, because the gap between flowering and collapse is the length of the window in which next spring was built and explains most unaccountable failures. And the week the berries reddened, which is the safety date if anyone small uses the garden.
If you keep more than one patch, keep the counts separately rather than averaging them. A patch in dry shade under a shrub and one in damp open ground run at different speeds and congest on different cycles, and the whole value of the notes is telling those two apart.