Gadenin日本語Get the appThe shape of a hellebore year
A hellebore flowers in the coldest part of the year, makes a full year's worth of leaves in the spring after flowering, sits quietly through summer, and begins pushing new roots and flower buds in autumn. Once you can see that sequence, every job in the calendar explains itself: the big cut goes just before flowering, the feed goes just after it, and the digging and dividing goes in early autumn when the roots are active again.
The one job that changes the plant more than any other is cutting last year's leaves off in late winter, before the flower stems lengthen. It reveals the flowers, which would otherwise bloom down inside a mound of tired foliage, and it removes the overwintering leaf spot that would otherwise infect the new growth. Everything else in the year is maintenance; this one is transformation.
In the southern hemisphere, read the seasons as written rather than converting them to months, and let the plant tell you where it is: buds appearing at the crown, flowers opening, pods swelling, new leaves expanding, then a long quiet summer.
| Season | What the plant is doing | What to do | What to leave alone |
|---|---|---|---|
| Late winter, before flowering | Flower buds sitting low in the crown | Cut every old leaf off at ground level and bin it | The buds and any pale new leaves |
| Winter, in flower | Flowers open, pollinated by bumblebees | Look inside the flowers; cut a few short-stemmed heads to float indoors | No feeding, no digging, no moving the plant |
| Early spring | Flowers fading, seed pods swelling, new leaves pushing | Cut spent flower stems out; feed and mulch; keep two or three pods if you want seedlings | The new leaves, which have to last a whole year |
| Late spring | Leaves expanding fast; pods ripening | Water through dry spells; watch for aphids; collect seed as pods split | The crown; nothing to be dug or divided now |
| Summer | Growth slows, leaves working, roots resting | Keep the mulch intact; remove any blotched leaf you see | No feeding, no dividing, no cultivating near the roots |
| Early autumn | New roots and flower buds forming | Divide congested clumps; plant new ones; sow any stored seed | Healthy, well-flowering clumps, which need nothing |
| Late autumn | Buds developing at the crown | Clear fallen leaves off the crown; check that water drains away | No feeding, no mulch piled over the center |
Late winter and winter: the cut, and then the show
Start the year with the big cut. Once the flower buds are visible at the base of the clump but before the stems have lengthened, take every one of last year's leaves off at ground level, leaving no stubs, and put them in the bin rather than the compost pile. On the shrubby upright kinds, leave the leaves alone and instead remove whole stems only after they have flowered.
Then enjoy the flowers, which is the point of the plant. Look inside them rather than at them, since the markings are on the inner face and the flowers hang downwards by design, to keep winter rain off the pollen. Cut a few heads with very short stems and float them face-up in a shallow bowl of water indoors, where they last for days.
The other winter job is negative. Walk out after heavy rain and look at the ground around each crown. Water pooling there through a cold winter is what causes crown rot, and the response is to lead it away at the surface rather than to dig near the roots. Check too that mulch or fallen leaves have not drifted over the center of any plant.
Spring: the feed, the seed decision and the growing weeks
As the sepals lose their color and the seed pods start to swell in the center of each flower, flowering is over even though the plant still looks as though it is blooming. This is the moment for the year's one real feed. Scatter a balanced slow-release fertilizer or a couple of handfuls of well-rotted manure around each clump, keep it off the crown, and cover the root area with two inches (5 cm) of leaf mold. Do not dig it in.
At the same visit, decide about seed. Ripening a full crop of it takes strength that would otherwise go into next winter's flowers, so cut most of the spent flower stems out at the base and keep only two or three pods from the plants you would most like seedlings of. Remember that those seedlings will not match the parent.
Through the rest of spring, the plant is building a full year's foliage and needs water to do it. Check the soil two inches (5 cm) down through any dry spell and soak the whole root spread when it is dry at that depth. Watch the flower stems and shoot tips for aphids, and wash them off rather than spraying, since their real significance is as virus carriers. Collect seed as the pods gape, and sow it fresh.
Summer and autumn: rest, then the only digging window
Summer is the quiet half of the year. The leaves are mature and working, the roots are largely resting, and the plant asks for very little beyond a mulch that stays intact and shade from the worst afternoon sun. Pick off individually any leaf that develops the dark blotches of leaf spot, and bin it. Otherwise leave the clumps alone: this is the worst possible time to divide, move or feed a hellebore.
Early autumn is the one window in the year when disturbance is acceptable, because roots and buds are becoming active again and the plant has months of cool, moist weather ahead to settle in. Divide congested old clumps now if you want copies of a particular plant or need to rejuvenate a woody center. Plant new hellebores now too, setting the crown level with the surface, never below it.
Later in autumn, sweep fallen leaves off the crowns so they are not sitting under a wet mat all winter, check once more that surface water drains away from each plant rather than towards it, and then stop. Feeding this late produces nothing useful, and the buds that will flower in a few weeks are already formed.
Do not fork over a bed containing hellebores in autumn. The roots run within the top few inches of soil and well beyond the spread of the leaves, and cutting through them in autumn costs you flowers all the following winter.
The notes that make each year easier than the last
The most useful entry in the whole record is the date you cut the old leaves off, together with how far along the flower buds were at that moment. Get it right and you reveal the flowers just before they open; get it wrong in either direction and you either stare at a bare clump for weeks or cut through flower stems. Three years of notes pin that week down exactly for your own garden and your own climate.
Beyond that, record for each clump the date the first flower opened and the last faded, the number of flower stems compared with last year, the date you fed and mulched, whether you left pods on and how many seedlings appeared as a result, and the first date you saw black blotching or aphids. Keep the position of every plant written down as well, since a hellebore is invisible between the late-winter cut and the new leaves expanding, and that is precisely when a fork tends to go in.