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Nerine is a bulb from a summer-dry climate, and it behaves in the garden exactly the way that origin suggests. It sits empty and apparently dead through the hottest months, throws up flower stems in late summer or autumn from bare ground, and then makes its leaves and grows all winter. Everything about where you put it should be judged on one question: will this ground get genuinely hot and genuinely dry while the bulb is asleep in summer?
The classic position, and still the best one, is a narrow border at the foot of a south- or west-facing wall, where the masonry holds heat into the evening and the overhang keeps summer rain off. A gravel strip along a path, the base of a sunny fence, the front edge of a raised bed, or a hot bank all work for the same reason. What does not work is the middle of a mixed border that gets watered for the sake of annuals, a bed shaded by a wall from midday onward, or any low pocket where water lies after heavy rain.
Pick that spot as a permanent home rather than a temporary one. Nerine flowers best from a congested, established clump, and every disturbance costs you flowers. Plan on leaving the planting undisturbed for at least five years, and often ten or more.
Depth: the neck of the bulb stays out of the ground
This is the detail that separates a clump that flowers from one that only makes leaves. Nerine is planted shallow, with the top third of the bulb, including the whole neck, sitting above the soil surface and in full view. Buried like a daffodil, at three times its own depth, it will grow perfectly good foliage and produce very few flowers, because the growing point never gets the summer heat that ripens it.
Where winters are severe enough that exposed necks are at risk, the answer is not deeper planting but a loose winter mulch of grit, bark or dry leaves drawn over the shoulders and pulled back off in spring. That keeps the frost off without insulating the bulb from summer sun.
Space them close. Bulbs set four to six inches (10 to 15 cm) apart will knit into a congested mat in three or four seasons, which is precisely the state in which nerine flowers hardest. Generous spacing looks tidier the first year and delays flowering by two.
| Detail | What to do | Why |
|---|---|---|
| Planting depth | Top third of the bulb, neck included, above the soil | Sun on the bulb shoulders in summer is what sets flower buds |
| Spacing | 4 to 6 inches (10 to 15 cm) between bulbs | Crowding brings the clump into flower sooner and keeps it flowering |
| Aspect | South or west facing, backed by a wall or fence if possible | Reflected heat extends the summer bake |
| Soil | Free draining, gritty, not enriched | Rich damp soil gives leaves at the expense of flowers |
| Best planting season | Late summer, as growth is about to restart | The bulb roots straight away instead of sitting wet and idle |
| Depth of soil disturbance later | None once planted | Root damage costs a season or two of flowers |
Putting the bulbs in
The physical job takes minutes. The preparation is mostly about drainage, and the discipline is about resisting the urge to improve the soil. Nerine planted into a bed that has been heavily manured will reward you with fat leaves and empty autumns.
- Loosen the soil, do not enrich it Fork the top eight inches (20 cm) so the roots can run down, and work in coarse grit or sharp sand if the ground is heavy. Skip the compost and manure entirely. Nerine needs drainage, not fertility, and a rich bed encourages leaf growth and summer rot.
- Scoop a shallow hollow, not a hole Take out just enough soil to seat the base and the lower two thirds of the bulb. If you find yourself digging a proper hole you are about to plant it too deep. A handful of grit in the bottom under each bulb helps water drain away from the base plate.
- Set the bulb upright with the neck clear Sit the bulb on its base plate, pointed neck straight up, and draw the soil back around it so the shoulders and neck remain exposed. Firm gently with your fingers rather than treading, so you do not compact the drainage you just created.
- Space the rest of the group closely Work along the strip setting bulbs four to six inches (10 to 15 cm) apart, in a band two or three bulbs deep rather than a single thin line. A group of at least seven reads properly when the flower stems come up, and a dense band supports itself in wind.
- Water once, then stop Give the planting a single soaking to settle the soil around the roots. After that let the weather do the work. If the ground is already moist from autumn rain, do not water at all.
- Mark the position before it disappears Push in a label or a short cane at each end of the band. The bulbs will vanish completely in summer, and an unmarked nerine patch is exactly the sort of empty ground that gets forked over or planted with something else.
Pots, if you have no hot wall
In a container, everything about nerine intensifies. Use a pot barely larger than the group of bulbs, three in a six-inch (15 cm) pot or five in an eight-inch (20 cm) one, with the necks standing proud of the compost exactly as in the ground. A gritty, free-draining mix, about two parts loam-based compost to one part coarse grit, is right; peat-heavy mixes hold too much water through the summer rest.
The reason to keep the pot tight is the same reason to plant closely in the ground. Nerine flowers when its roots are crowded, and a bulb rattling around in a generous pot will spend years filling it before it thinks about flowering. Do not pot on because the clump looks congested. Congested is the goal.
Wash your hands after handling the bulbs, and keep them away from children and pets. Like other bulbs in its family, nerine contains alkaloids that cause vomiting if eaten, and the sap can irritate sensitive skin.
The first year, and what to write down
Do not judge a new planting by its first autumn. Bulbs lifted and replanted commonly skip one flowering season while they re-root, and sometimes two, even when everything has been done correctly. What you should see in the first winter is a fan of strap-shaped leaves; that is the sign the bulb has taken and is feeding itself. Flowers follow once the clump has settled.
Write down the planting position and the number of bulbs, the date you planted them, and the first date each following autumn on which a flower stem breaks the surface. Note also whether that stem came from the crowded middle of the band or the loose edge. After three seasons those notes will tell you plainly whether your spot is hot enough and whether the clump is crowding up on schedule, and they will stop you from digging into a patch that merely looks empty in summer.