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A dry anemone corm looks nothing like a bulb. It is a hard, dark, wrinkled lump somewhere between the size of a pea and the size of a hazelnut, often with a few knobbly points at one end and a rough scar at the other. There is no papery tunic, no flat basal plate, no shoot tip. People open the bag, look for the pointed end that every bulb guide talks about, and cannot find one. That is normal, and it matters far less than the packet suggests.
The corm in that state is severely dehydrated. It was lifted at the end of its growing year, dried down for storage, and has lost most of its water. Planted dry, it will still grow, but it has to rehydrate through the soil first, which takes a week or more and gives rot a long window to get in through the shriveled surface. Soaking first is the single change that most improves the strike rate, and it is the reason experienced growers rarely lose a batch.
Soak for a few hours, and no longer
Put the corms in a bowl of tepid water, roughly the temperature of a warm room rather than hot from the tap, and leave them for three to four hours. They swell visibly. A corm that was hard and pea-sized will roughly double, go plump and slightly paler, and feel firm instead of woody. That change is the point of the exercise: you can see for yourself that it worked.
Do not leave them overnight, and never for a full day. Anemone corms sitting in still water for twelve hours or more start to ferment, the water goes cloudy and smells sour, and a proportion of the batch will rot in the ground instead of sprouting. If you cannot plant on the same day, drain them, spread them on paper for an hour, and plant the next morning at the latest. Changing the water once halfway through the soak, or running an aquarium airstone in the bowl, keeps it fresher if you are soaking a large number.
Discard anything that stays hard and light after four hours in water, or that has gone soft and squashy in the same time. A sound rehydrated corm feels like a firm cork; a dead one feels like a dry stone or a wet sponge.
A few corms in every bag stay stubbornly small. Plant them anyway, at the edge of the block where you will not mind a gap. Many of them come up two or three weeks behind the rest, which quietly extends your season.
Which way up, and how deep
After the soak the corm is easier to read. The knobbly, claw-like points are the base and go downward; the rougher, flatter scar is the top. If you genuinely cannot tell, plant it on its side. Anemone shoots have no trouble finding their way up from a corm laid horizontally, and a batch planted entirely on their sides performs no worse than a batch planted with painstaking care. The one thing to avoid is planting a clearly pointed corm firmly point-upward and then wondering why it is slow.
Two inches (5 cm) deep is right in open ground, a little shallower in a pot. Space them three to four inches (8-10 cm) apart. That is closer than most bulbs, and it is deliberate: anemones make a small plant, and a tight block of them reads as a drift of flowers, whereas the same corms spread out at six inches (15 cm) look like scattered individuals. Plant them in blocks rather than rows if you are growing for the house.
| Item | In the ground | In a pot or container |
|---|---|---|
| Soak time | 3-4 hours in tepid water | 3-4 hours in tepid water |
| Depth | 2 in (5 cm) | 1-1.5 in (3-4 cm) |
| Spacing | 3-4 in (8-10 cm) | 2-3 in (5-8 cm) |
| Orientation | Points down, or on the side | Points down, or on the side |
| Soil | Free-draining, moisture-retentive, neutral | Multipurpose mix with added grit |
| Water after planting | Once, then leave until shoots show | Once, then keep barely moist |
Planting in batches to stretch the season
A single planting of anemones flowers hard for about four to six weeks and then stops. That is a short window for a plant that takes up bed space for months. The fix is simple and costs nothing: divide the corms into three lots and plant them two to three weeks apart. Each batch runs its own four-to-six week course, and the overlaps give you flowers over two to three months instead of one.
The timing that governs everything is cold, not the calendar. Anemone corms root best in cool soil around 50-60F (10-16C) and shoots come through happily at 45F (7C). Where winters stay above roughly 20F (-7C) with reliable snow-free ground, plant in autumn for flowers from very early spring. Where winters are harder, plant the first batch as soon as the ground is workable in late winter or early spring and follow with the others. A frost cloth or a cold frame over an autumn planting extends the range of the autumn option considerably.
- Split the order into three Weigh or count the corms into three roughly equal lots before you soak anything. Keep the two later lots dry, cool and dark in paper, not plastic. Soaking a lot you are not about to plant wastes it.
- Prepare the whole bed at once Fork the area over, work in a couple of inches (5 cm) of compost, and level it. Doing all the soil work up front means the later plantings take ten minutes each and you are not digging next to emerging shoots.
- Plant lot one and mark the block Push in labels or short canes at the corners. Anemone corms are invisible once covered and the shoots take two to four weeks to appear, so an unmarked block gets forked over or planted into by accident.
- Plant lots two and three on a two to three week rhythm Soak each lot on the morning you plant it. Slot them into a block beside the last, not among the previous corms, so you can tell later which batch is which and how each performed.
- Water once, then stop Give the block a single soaking to settle the soil and then leave it alone until shoots appear. Rehydrated corms in wet soil with no leaves to draw water are the classic way to lose a batch to rot.
The first weeks, and what to write down
Expect ferny, parsley-like leaves two to four weeks after planting, and first flowers roughly ten to twelve weeks after that from a spring planting, or considerably faster from an overwintered autumn one. Nothing above ground for six weeks in cold soil is not necessarily failure; lift one corm from the edge of the block and look for white roots before you write the batch off.
Record the planting date of each batch, the number of corms in each, and the date the first flower opened in each. Two seasons of that tells you, for your own garden and nobody else's, exactly how many weeks lie between planting and picking, and therefore when to start each batch next year to hit the weeks you actually want flowers. Note the position of the blocks too, because you will be lifting the corms later and a sketch beats memory.