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Spider lily resents disturbance more than almost any common garden bulb. Lift it, split it, or even knock it hard with a spade, and it will very often skip flowering entirely the following autumn and sometimes the one after that as well. The bulb survives, puts up leaves, and simply declines to produce a stem until it has rebuilt itself. That single trait should drive the whole planting decision: pick a place you can leave untouched for five or ten years, not the best-looking gap in this season's border.
The ideal position is one that is sunny to lightly shaded in autumn, when the flowers appear, and hot and dry in summer, when the bulb is dormant. Along a south-facing wall, at the foot of a deciduous tree, on a bank, at the edge of a path, or in a strip of rough grass that nobody irrigates all suit it well. What ruins it is a bed that is watered through summer for the benefit of annuals planted over the top, or a low spot where water stands after a storm.
Avoid planting it among things that need frequent dividing or replanting. Every time you fork over the ground around a spider lily you set it back. Neighbors that stay put for years, such as established shrubs, ferns, or ornamental grasses, are much better company than a bed that gets remade each season.
Handle the bulbs knowing they are poisonous
Every part of spider lily is toxic, and the bulb is the most concentrated part. It contains alkaloids that cause vomiting and severe stomach pain if eaten, and the sap can irritate skin on prolonged contact. This matters at planting time above all, because that is when the bulbs are out of the ground, sitting in a tray, and look very much like an onion or a shallot to anyone who did not put them there.
Wear gloves, keep the bulbs out of reach of children and dogs while you work, do not store them anywhere near food or seed potatoes, and wash your hands before eating. If a bulb is damaged and leaking sap, handle it with gloves and do not rub your eyes. None of this makes the plant unsuitable for a garden, and it is one of the reasons deer, rabbits, voles and squirrels leave it entirely alone, but it does mean the bulbs should never be left lying loose in a shed.
The toxicity is a genuine advantage in the ground. Rodents that hollow out tulip and crocus bulbs will not touch spider lily, which is why it is a reliable choice in gardens where voles make other bulbs impossible.
Depth, spacing and orientation
The single most common planting mistake is burying spider lily too deeply. Unlike most autumn-planted bulbs, it wants to sit high, with the neck at or just below the soil surface in mild areas, and only slightly deeper where winters are hard. A bulb planted six inches down will grow leaves happily and may never flower at all.
The bulb is a rounded, dark-tunicked shape with a distinct elongated neck at the top and a flat rooting plate underneath. Orientation is obvious and worth getting right, because a bulb planted on its side wastes energy correcting itself. Plant them singly at a proper spacing rather than in tight clusters; the clump will fill in on its own and crowding brings forward the day when it needs dividing, which is exactly the job you want to postpone.
| Item | Figure | Why it matters |
|---|---|---|
| Depth in mild winters | Neck at soil level, shoulders just covered | Shallow planting is what triggers reliable flowering |
| Depth in cold winters | 2 in (5 cm) of soil over the top of the neck | Just enough cover to protect from freeze and thaw |
| Spacing | 6 to 8 in (15 to 20 cm) apart | Leaves are broad and the clump doubles within a few years |
| Bulbs for a visible group | 5 to 7 in a loose cluster | Single stems read as accidents; a group reads as a planting |
| Soil | Free-draining, ordinary fertility | Rich, moist ground gives lush leaves and few flowers |
| Site to avoid | Any bed irrigated through summer | Summer wet at bulb depth causes rot and suppresses flowering |
Getting them in the ground
Plant in late summer while the bulbs are still dormant, or immediately after flowering in autumn if that is when you obtain them. Dormant bulbs establish with less setback, which is the whole point. Work quickly, because spider lily bulbs are not built for long storage and shrivel in dry air.
- Loosen the top 8 in (20 cm) and check the drainage Fork the area over and pour a bucket of water into a test hole. If it has not drained away within an hour, do not plant there; raise the bed by a few inches or move to a slope instead. Summer wet is the one condition that kills established bulbs.
- Skip the compost and the fertilizer Do not enrich the hole. Spider lily flowers best in lean, gritty ground, and nitrogen-rich soil produces broad, lax leaves through winter with no improvement in autumn stems. If the soil is heavy clay, work in grit for drainage rather than organic matter for fertility.
- Set each bulb high, neck upward Sit the flat rooting plate on firm soil and draw the earth back around the shoulders, leaving the neck at or barely under the surface. Resist the instinct to plant deeper for tidiness. The exposed neck is normal and correct for this plant.
- Water once, then stop Settle the soil with a single watering to bring it into contact with the rooting plate. After that, leave it to the weather. Roots form in autumn, and repeated watering into warm, bare ground only encourages rot before the roots are working.
- Mark the spot clearly Push in a permanent label or a short cane. For most of summer there is nothing above ground at all, and the commonest way people lose spider lily is by forking through it while planting something else in what looked like an empty patch.
What happens in the first year, and what to write down
Do not expect much from a first autumn. Bulbs planted in late summer sometimes flower within weeks of going in, but many spend the first season rooting and produce nothing but the strap-shaped leaves that follow in autumn and stand through winter. A blank first autumn is normal and is not a sign of a bad bulb. Flowering usually settles into a rhythm from the second or third year onward.
Record the planting date, the exact position of every bulb sketched against something permanent such as a wall corner or a tree trunk, and the depth you used. The position note is the important one, because you are planting something that is invisible for months at a time and that punishes accidental disturbance with a lost flowering season.
Add one more line each autumn: whether the flower stems appeared, and how many. Over four or five years that count tells you whether the clump is building toward its peak or has become congested, and it is the only reliable basis for deciding when the disturbance of dividing is finally worth the cost.