Ornamental · Ranunculaceae
Columbine
Aquilegia canadensis
Hand it dappled shade and moist, free-draining soil, and columbine pays you back with spurred spring flowers that hummingbirds can't resist.
Partial shade
Every 5–10 days
USDA 3–8
1–3 ft · 0.3–0.9 m
Overview
Columbine's a woodland perennial in the buttercup family, and the native Eastern red type, Aquilegia canadensis, grows wild all over much of eastern North America. Its nodding, spurred flowers dangle on thin stems above soft, blue-green leaves, and they bring in hummingbirds as soon as spring warms up. It looks dainty, sure, but it's a lot tougher than it lets on.
This one's an easy pick for partial shade, perfectly content along a border edge or tucked into a woodland spot where bigger plants give it some cover. It shrugs off hard winters down to USDA zone 3 and keeps going through summers up to zone 8. It's short-lived for a perennial, but here's the thing: it self-seeds so freely that a patch basically renews itself and spreads into loose colonies.
Give it soil that holds moisture but still drains well, and you're basically done. Across the genus the flowers come in all sorts of colors, from the red and yellow of the native species to the blues, whites, and pinks of the old European types. Let a few seedheads ripen and guess what? You'll spot new plants popping up nearby every season.
Care
The short version: partial shade plus rich, moist, well-drained soil. Water to keep the ground evenly damp without letting it go soggy, give it a light feed in spring, and trim back tired foliage after bloom to neaten it up and slow down the self-seeding.
Light
Columbine likes partial shade best, the kind of dappled light you'd find at a woodland edge. It'll handle full sun in cooler areas and it's fine in partial sun too, but when summers get hot, a bit more shade keeps it from scorching.
Water
Keep the soil evenly moist but never soggy, watering about every 5 to 10 days once you factor in the rain. An established plant can handle the odd dry stretch no problem, but wet ground through a hot summer is asking for crown rot, so let the surface dry out a touch between waterings.
Soil
Plant it in rich, well-drained loam mixed with some organic matter, though columbine's happy in sand or clay too, as long as the water actually moves through. It handles a wide pH range from 6.0 to 8.0, so most garden soil works without any fuss.
Temperature
This is a tough, cold-hardy perennial, comfy across USDA zones 3 to 8 and shrugging off temperatures from -40°F to 90°F (-40°C to 32°C). That deep winter cold actually does it a favor, since the seeds need a chill before they'll sprout.
Humidity
Regular outdoor humidity is all it wants, so there's no number to worry about. What really matters is air movement, because still, crowded air is what lets powdery mildew settle in on the leaves.
Feeding
Columbine doesn't eat much. One balanced feed or a topdress of compost in spring carries it through the season, and loading on more fertilizer than that just invites aphids onto the soft new growth.
Pruning
Snip off the spent flower stems after bloom to coax out a second flush and rein in the heavy self-seeding. If the foliage looks ragged by mid-summer, just shear it to the ground and fresh leaves will come right back.
Size & spacing
Plants get 1 to 3 feet (30 to 91 cm) tall and spread 12 to 18 inches (30 to 46 cm) across. Give each one about that much space so air can move through the clump and mildew stays out of the picture.
When to plant
Columbine's all about spring. You can start seed indoors in late winter after a cold spell to break dormancy, or just sow it straight into the ground in spring or fall. The spurred flowers open from March into May and stick around for four to six weeks before the plant eases off for summer.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: Late winter, 6 to 8 weeks before last frost; seeds benefit from cold stratification.
- Plant: Spring after last frost, or sow seed outdoors in fall.
- Harvest: Spring (March to May), with bloom lasting about four to six weeks.
Hardiness
USDA hardiness zones: 3–8
Temperature: down to -40°C
Troubleshooting
Columbine's an easy plant, and when something's off, it usually shows up on the leaves or down at the base. Catch it early and a quick trim or a watering tweak normally sorts it out. Find what matches what you're seeing below, then go from there.
Plant flopping and rotting at the base in summer
If the whole plant flops in the heat and the base goes soft and brown, that's crown rot, and it comes from soil that's stayed too wet and stuffy. Here's the hard part: there's no bringing back a plant once it's hit, so dig it out. Before you replant, loosen up the drainage, and go easy on the watering through the worst of summer.
Fix:
- Remove affected plants
- Improve soil drainage before replanting
Pale squiggly trails snaking over the leaves
See those weird squiggly lines on the leaves? That's leaf miner larvae having a snack between the top and bottom of the leaf. It looks rough, but it's purely cosmetic, so the plant won't miss a beat. Just pull off the leaves that are marked up, and once the flowers are done, cut the foliage right back so a clean batch of new leaves can take over.
Fix:
- Remove and destroy mined leaves
- Cut affected foliage to the ground after bloom to flush fresh growth
- Choose resistant species such as Aquilegia canadensis
Tiny soft bugs piling onto buds and new tips
Those little green or black clusters on the new tips are aphids, and they sip the sap until the fresh leaves curl up and turn sticky. The good news? A strong spray of water usually knocks them loose, and insecticidal soap is there if a crowd really digs in. Going light on nitrogen feed helps too, since that soft, juicy growth is exactly what they're after.
Fix:
- Spray plants with a strong jet of water
- Apply insecticidal soap if populations are heavy
Chalky white dust spreading on leaves and stems
That chalky white film on the leaves? That's powdery mildew, a fungus that loves still air and plants packed in too tight. The fix is easy: give your columbines room so the air can move around them, and pull off any leaves that are coated. Watering down at the soil instead of over the leaves keeps things dry up top, which the mildew really doesn't like.
Fix:
- Improve air circulation by spacing plants
- Remove and destroy infected foliage
Toxicity
Columbine is only mildly toxic, and the showy flowers are pretty harmless. The real concern? The seeds and roots, which hold cardiogenic toxins and cyanogenic glycosides that can upset the stomach if someone eats a lot. Normal gardening doesn't need any special handling, just keep pets and kids from snacking on the seedpods.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Mild
If a cat goes after the seeds or roots, it might drool, throw up, or get a loose stomach. The flowers and leaves are pretty harmless, and you'll only see trouble if it eats a fair bit.
Dogs Mild
Most dogs come away just fine. It's really only when one chews through a bunch of the seeds or roots that you'd see some drooling and a short run of vomiting or diarrhea.
Horses Mild
Horses usually steer clear of columbine, so a random mouthful barely registers. You'd need a big helping of the seed or root parts before their stomach gets upset at all.
Rabbits Mild
It's smart to keep rabbits away from the seedpods and roots, since that's where the cyanogenic compounds gather. A quick nibble of the leaves usually means nothing worse than a brief tummy ache.
Livestock Mild
Cattle, goats, and sheep tend to leave it be, so poisoning hardly ever happens. Still, if they graze hard on the seeds or roots, it can throw their digestion off a bit.
Birds Mild
The flowers feed hummingbirds beautifully, no harm done. The catch is the seeds, which hold the cyanogenic glycosides, so don't let poultry stuff themselves on the ripe pods.
People Caution
Columbine isn't something to eat. The flowers are low-risk, but the seeds and roots carry cardiogenic toxins, so eating much of those can upset your stomach and is best skipped, especially for kids.
No special handling is needed for routine gardening; wash hands after extended contact and supervise pets and children around the seeds.
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
Columbine runs the gamut from a tough little native wildflower to big, flashy garden hybrids. Here are the ones you're most likely to run into.
Aquilegia canadensis (Eastern red columbine)
This is the native one, with nodding red and yellow spurred flowers on thin wiry stems, and it barely notices the leaf miner that wrecks its cousins.
Aquilegia vulgaris (Granny's bonnet)
The classic European columbine shows up in blue, violet, white, pink, or red, though it takes leaf miner damage a lot harder than the native does.
Aquilegia chrysantha (Golden columbine)
A southwestern type with long-spurred yellow flowers that shrugs off heat better than most, but watch the drainage, because it rots at the crown fast in soggy ground.
Aquilegia × hybrida (Hybrid columbine)
Want the showy ones? These garden hybrids have the biggest, often two-toned long-spurred flowers in the widest color range, opening from mid-spring into early summer.
How to propagate
Columbine pretty much propagates itself, but you can give it a hand with saved seed or a careful division of a clump that's already settled in.
SeedEasy
Sow indoors in late winter with cold stratification, or direct sow outdoors in spring or fall. · Seedlings typically flower in their second year.
Seed is the easiest way to get more columbine, and honestly the plant does most of it for you, self-seeding into loose little colonies wherever it's happy. You can start seed indoors in late winter after a cold spell to wake it up, or just toss it outside in spring or fall. Either way, don't expect flowers until the seedling's second year, since that first year goes into building a crown.
DivisionModerate
Early spring or fall. · One growing season; columbine has a deep taproot and resents disturbance, so divide carefully.
You can divide in early spring or fall, but it's the trickier option. Columbine puts down a deep taproot and really doesn't like being messed with, so lift and split the clump gently and get the pieces back in the ground right away. Give it one growing season and a careful division will settle in, though seed is still the safer bet.
Myths
Columbine is deadly poisonous and should never be grown around pets or children.
Good news here, because the genus is only mildly toxic and the extension folks list no serious poisoning issues with it. Sure, the seeds and roots have cyanogenic compounds, so a big mouthful of those can give a mild stomach ache, but the plant is safe to grow with normal supervision and the flowers are low-risk.
Every columbine gets chewed to ribbons by leaf miner.
It really depends on which one you plant. The native Aquilegia canadensis holds up well against leaf miner, while the hybrids and other species often get hit hard, so picking a resistant species is the simplest fix.