Gadenin日本語Get the appEmpty ground doing the year's most important work
In late spring the winter leaves yellow, flop and dry off, and within a few weeks the nerine strip looks like bare soil. Nothing is failing. The bulb has drawn its reserves back down, shut off its roots and entered a true rest, and the heat it now receives on its exposed shoulders is what ripens the flower buds for autumn. A nerine that is kept cool, shaded or damp through this period will come through summer alive and flower poorly or not at all.
The practical consequence is that summer care consists almost entirely of things you do not do. You do not water, you do not fork the ground, you do not plant annuals over the top, and you do not mulch the surface with anything that holds moisture. If the strip looks untidy, top it with grit rather than filling it with bedding.
The greatest risk in this period is that somebody, often you, forgets the bulbs are there. Mark the ends of the planting with a permanent label or a low edging stone before the leaves die, so the empty ground is obviously spoken for.
Heat and dryness are the trigger, not a hardship
It helps to treat the summer bake as an active treatment rather than a survival test. The warmer and drier the soil around the necks of the bulbs during dormancy, the more flower stems appear in autumn. This is why the foot of a sunny wall outperforms an open bed even when both are in full sun: the wall radiates heat through the evening and keeps rain off the strip.
| Condition in summer | Effect on autumn flowering | Fix |
|---|---|---|
| Hot, dry, sun on the exposed bulb necks | Best flowering; many stems from a crowded clump | Nothing to do. Keep the strip clear |
| Sun in the morning only, shade from midday | Noticeably fewer stems each year | Cut back overhanging growth or replant into a hotter position |
| Regular irrigation reaching the bulbs | Leaves may appear early, flowering weak, rot risk high | Reroute the irrigation or move the planting out of its range |
| Thick organic mulch over the bulbs | Cool damp necks, few flowers, soft rot at the base | Rake the mulch off and replace with grit |
| Wet, cool summer with persistent rain | A weak autumn even in a good position | Consider growing a group in a pot that can be moved under cover for the rest |
| Bulbs recently lifted and stored | Usually no flowers that autumn | Replant promptly and wait; expect flowering to resume in the second or third year |
If you must lift or divide, this is the window
The only reason to disturb an established nerine is that flowering has declined over several years in a clump that has become a solid raft of bulbs pushing themselves out of the ground. If that describes yours, do the work either immediately after flowering finishes or at the very end of the leafy season as the foliage fades, and get the bulbs back into the ground the same day. Both windows work; what fails is lifting bulbs and leaving them lying about for weeks.
- Confirm the clump really is finished Look for three or more consecutive seasons of declining stem counts, with bulbs visibly heaved up and pressing against each other in a solid mass. A single poor autumn is not a reason to dig, and a clump that is merely crowded is doing what it is supposed to do.
- Prepare the new position first Loosen the receiving ground, work in grit if it is heavy, and have it ready before you lift anything. Bulbs out of the ground for hours in the sun lose condition, and the point of the exercise is to shorten the disturbance as far as possible.
- Lift the whole raft from well outside it Push a fork in a foot (30 cm) beyond the edge of the clump and lever the entire mass up in one piece. Working in close to save effort simply cuts through the shallow roots you are trying to preserve.
- Separate only where the bulbs part easily Pull the raft apart with your hands into clusters of three to five bulbs. Do not cut or force single bulbs apart. Discard anything soft, hollow at the base, or smelling sour, and keep the fattest bulbs with intact roots.
- Replant tight, and shallow, the same day Set the clusters back four to six inches (10 to 15 cm) apart with the necks standing clear of the soil, exactly as for a new planting. Replanting in tight groups rather than spread out gets the clump back into flower a season or two sooner.
- Water once and then leave it alone Give one settling soak, then treat the planting as dormant again until stems or leaves appear. Do not feed and do not keep the soil moist through the rest of the summer.
Expect the divided clump to skip a flowering season, and possibly two. That is the normal cost of disturbance and not a sign that anything went wrong. Leaves in the first winter after division are the sign that the bulbs have taken.
Pots and stored bulbs over summer
A potted nerine spends the summer standing dry in full sun, on a hard surface or a shelf where water cannot wick into the pot from below. Do not move it into shade to protect it, and do not water it at all until the first flower stem shows. Where summer rain is persistent, stand the pot against a wall under an eave or in a well-ventilated greenhouse so the compost stays dry.
If bulbs have to be out of the ground for a short while, keep them cool, dry and in the dark in an open tray or a paper bag with a little dry sand, never sealed in plastic, and check them weekly for softness. This is a holding measure of days, not months. Nerine has fleshy roots that do not tolerate long storage, and every extra week out of the ground pushes the return to flowering further away.
What to record during dormancy
Write down the date the last leaves died away, and treat that as the start of the dry rest. Note anything that happened to the strip afterwards: rain that soaked it, an irrigation line that ran, a neighboring plant that grew across it, a mulch you spread. Then record the date the first flower stem appeared in autumn.
The gap between those two dates, set against how hot and dry the summer actually was, is the most useful single measurement you can keep for this plant. After two or three years it becomes obvious which summers produce a heavy autumn and which do not, and, more practically, it catches the slow encroachment of shade or moisture that no one notices season by season.