Bulb · Amaryllidaceae
Red Spider Lily
Lycoris radiata
Set the bulbs with the neck above the soil, then watch bare scapes rocket up into fiery red blooms come early fall.
Partial shade
Every 7–14 days
USDA 6–10
12–24 in · 30–61 cm
Overview
Few bulbs bring the drama of the red spider lily, a fall bloomer in the amaryllis family that puts on a real show. Once the first cool rains hit, bare stems shoot skyward and burst into clusters of scarlet, spidery flowers. The leaves keep to their own timetable, so by flowering the foliage has already cleared out and the blooms leap up from bare ground like a magic trick.
The best part is how it flips the usual calendar on its head. Strappy green leaves surge up in fall and soldier through winter, then bow out by late spring while the bulb powers down for the summer heat. As late summer swings toward fall, the flower scapes punch through with no leaf attached, which is exactly how it collected the fun names naked lily and surprise lily.
Hardy across roughly zones 6 to 10, these bulbs dig in and naturalize, coming back stronger each year and spreading into ever-wider clumps. Just one thing gets them going, and that is sharp drainage. Give them well-drained ground with the neck of the bulb above the soil, and they reward you for years with almost no effort.
Care
The short version: plant the bulbs in fall with the neck exposed in rich, well-drained soil, hand them partial shade to full sun, keep the water coming through growth and bloom, then let it all dry out while the bulb powers down over summer.
Light
Partial shade brings out the best in the red spider lily, yet it charges ahead in full sun to partial sun too. Dappled light under tall trees suits it perfectly, and if a strong clump suddenly quits blooming, deep shade is usually the culprit, so shift it somewhere brighter and watch it respond.
Water
Keep the water flowing at medium moisture while the leaves and flowers are up and working, hitting it about every 7 to 14 days as the soil dries. The moment summer dormancy kicks in, back right off and let the ground go fairly dry, because soggy soil over that rest is what rots the bulbs.
Soil
Plant it into organically rich, well-drained loam or sand and it takes off. It is easygoing about pH and rolls with anything from 6.0 to 8.0, but it flat out refuses waterlogged ground, so dig in grit or compost if your soil runs heavy.
Temperature
This bulb powers through a huge range, shrugging off winter lows near -9°F (-23°C) and summer heat up to about 86°F (30°C). That spread covers most temperate gardens inside its zones, so once it is planted the weather barely slows it down.
Humidity
Forget fussing over humidity, since plain outdoor air is all it wants. Drainage counts for far more than the air with this bulb, because the real threat is wet soil, not a dry or muggy stretch of weather.
Feeding
Fuel it with a balanced bulb fertilizer in fall and again in spring, right while the foliage is busy stockpiling next year's flowers. That seasonal feed during leaf growth is the whole plan, and it pays you back at bloom time.
Pruning
There is next to nothing to cut, which frees you up. Let the foliage die back on its own after the flowers finish so the bulb can recharge, then clear away just the spent flower scapes and any withered leaves.
Repotting
Spider lilies bloom their hardest when you leave them be. Divide a clump only every 3 to 5 years, or jump in sooner if the bulbs get crowded, the flowering drops off, or you catch bulbs heaving up out of the soil.
Size & spacing
12–24 in (30–61 cm) tall
When to plant
Lean into its upside-down schedule and the payoff is worth it. Plant in late summer to fall, let the leaves charge through winter and fade by spring, then get ready for the bare flower scapes to burst up and surprise you in late summer or early fall.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Plant bulbs in late summer to fall with the bulb neck exposed above soil level
- Harvest: Late summer to early fall (August to September)
Hardiness
USDA hardiness zones: 6–10
Temperature: down to -23°C
Troubleshooting
Here is the good news that keeps growing fun: nearly every spider lily snag comes back to the bulb, either sitting too wet or planted at the wrong depth. Dig in, read the signs below, and you can usually turn things around in a single session. Spot the symptom, act quickly, and rescue the clump before it slips away.
Soft, mushy bulbs that refuse to sprout
This is bulb rot, and it kicks off with wet ground, not some disease a spray can chase away. Leave bulbs sitting in waterlogged soil through the summer rest and they go brown and foul from the inside out. Move fast, lift the clump, toss anything soft, and replant only the firm bulbs in well-drained soil with the neck kept above the surface.
Fix:
- Lift affected bulbs and discard any that are soft or rotted
- Replant healthy firm bulbs in well-drained soil with the neck exposed
- Withhold water during the summer dormant period
Tunneled, hollow bulbs that barely get going
The offender is the narcissus bulb fly, whose larvae drill straight into a bulb and gut the center. Dig up a suspect one and a single fat grub usually turns up in a soft, hollowed core. Take action, destroy every infested bulb, replant only firm ones, and work the nearby soil to expose the pupae.
Fix:
- Lift and destroy infested bulbs
- Replant only firm, healthy bulbs
- Cultivate soil around plantings to expose pupae
Tons of leaves but hardly a flower in sight
When the foliage races ahead but the blooms never show, the bulbs are almost always buried too deep. These lilies want the top of the neck at or above the soil line, never tucked under. Lift and reset them shallow, thin any crowded clumps, and give a freshly moved planting a season or two to settle before the real show kicks off.
Fix:
- Replant bulbs with the top of the neck exposed above soil level
- Allow a few seasons for clumps to establish before expecting bloom
- Thin overcrowded clumps and site in full sun to partial shade
Toxicity
One thing calls for a firm hand, though. Every part packs lycorine and related alkaloids, and the bulb hits hardest of all, so it is not safe for cats, dogs, horses, rabbits, livestock, birds, or people. Pull on gloves before you dig into the bulbs, and stash them well out of reach of pets and children.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Mild
A cat that nibbles any part usually drools, vomits, and gets diarrhea. Guard the bulb above all, because a large dose can push it into tremors or convulsions.
Dogs Mild
Look for drooling, vomiting, and loose stools after a dog chews the leaves or digs up a bulb. The bulb carries the most alkaloid, so a big mouthful can set off tremors or seizures, and bulbs belong well out of reach.
Horses Toxic
That same lycorine in the foliage and bulbs hits a horse hard, driving heavy salivation, colicky belly pain, and diarrhea. Keep grazing animals clear of any planting.
Rabbits Toxic
These bulbs are no treat for a rabbit, and even a small taste of leaf or bulb can leave it drooling, off its food, and dealing with gut upset, so fence the plants out of reach.
Livestock Toxic
Cattle, goats, and sheep that graze the foliage or turn up bulbs can drool, scour, and go weak from the alkaloids. Keep stock off any ground where the bulbs grow.
Birds Toxic
The alkaloids reach birds too, so a curious parrot or backyard hen pecking at any part risks vomiting and gut distress. Keep birds well away from the plant and its bulbs.
People Caution
No part of this plant is food. Swallowing the leaves or, above all, the bulb brings on nausea, vomiting, and diarrhea, so wash your hands after handling and keep curious children well clear.
Wear gloves when handling and dividing bulbs and wash hands afterward; keep bulbs out of reach of pets and children.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
Poison Control: (800) 222-1222
Canada
Poison Centres: 1-844-764-7669
Varieties
Most growers chase just one form of the red spider lily, and it delivers. Still, a second form is out there, and it plays a completely different game once seed comes into it.
Lycoris radiata var. radiata
This is the form that turns up in gardens nearly every time, a sterile triploid that rarely sets seed and instead bulks up fast by pumping out offset bulbs.
Lycoris radiata var. pumila
This smaller, fertile diploid actually sets viable seed, which is exactly why breeders grab it.
How to propagate
Bulking up a spider lily patch is a blast, since the bulbs multiply all on their own and splitting a crowded clump hands you free plants. Seed only works on select forms and tests your patience for years, so most growers stick with the bulbs.
Offsets & pupsEasy
Early summer when foliage has died back and bulbs are dormant · One to a few growing seasons before reliable bloom
The easiest win is to let the bulbs do the multiplying, since they naturalize on their own through offsets. In early summer, once the foliage has died back and the bulbs are dormant, lift a clump, twist off the offset bulbs, and replant each one with the neck exposed. Give them a season or a few to settle in and they will flower well.
DivisionEasy
Summer dormancy after foliage dies back · One to a few growing seasons
Once a clump gets crowded, lift and split it during the summer dormancy after the leaves have withered, then get the pieces back in the ground right away. Do not sweat it if flowering takes a season or two off while the divisions find their feet again.
SeedDemanding
When ripe, on fertile diploid forms only · Several years to flowering
Seed rarely pays off for the wait it demands. The common garden triploid is sterile and almost never sets viable seed, so this route only works on the fertile diploid forms, and even then you are in for several years of growing before that first flower.
Myths
The red spider lily is just another name for the surprise lily.
Not a chance, since they are two different species. Lycoris radiata fires up red and handles far less cold, while Lycoris squamigera blooms pink-lilac and powers through much colder winters, so never expect one to act like the other.
The plant is safe because pets tend to leave it alone.
That is pure luck, not safety. Every part is loaded with toxic lycorine alkaloids, and the bulb carries the most, so a cat or dog that does grab a bite can wind up drooling, vomiting, and battling diarrhea. Keep it well out of reach.