Ornamental · Papaveraceae
Bloodroot
Sanguinaria canadensis
A short-lived white spring ephemeral for shade, with a sanguinarine-laden red rhizome to handle in gloves.
Partial shade
Every 3–7 days
USDA 3–8
6–10 in · 15–25 cm
Overview
Bloodroot opens among the earliest wildflowers of the eastern woodland spring. A single leaf emerges furled tightly around the flower bud, a strategy that shelters the bloom as it pushes through cold soil, then unrolls to display a clean white flower with a gold center above the leaf litter. The bloom holds for only a few days, which is the trade a spring ephemeral makes for flowering before the canopy closes.
The common name traces to the red-orange sap that wells from the rhizome wherever it is cut. That sap is loaded with sanguinarine and related alkaloids, the same compounds that make this a plant to admire rather than touch bare-handed. Native peoples valued it as a dye, and that pigment still stains skin and tools on contact.
Provide the conditions of a forest floor and it needs almost no intervention. Growth is slow but steady, knitting into a low colony over the years, then retreating underground by midsummer to escape the heat. Plant ferns alongside it and the bare patch left by its dieback never shows.
Care
The short version: site it in part to full shade in rich, moist, humusy woodland soil, hold the ground evenly moist through spring while it is in active growth, then let it dry and go dormant in summer without disturbing the rhizome.
Light
Bloodroot performs in part to full shade, the dappled light beneath a deciduous canopy. It can use a little direct sun in early spring before the trees leaf out, which is when it flowers, but a hot, exposed position dries the soil and shortens the display.
Water
Hold the soil evenly moist through the spring growing season, watering every few days during dry spells while the leaves are working. Once the plant enters summer dormancy it no longer needs the moisture and tolerates dryness, so you can stop watering after the foliage fades.
Soil
Plant into moist, humusy, well-drained soil high in organic matter, the kind that accumulates beneath fallen leaves. A pH between 6.8 and 7.2, close to neutral, suits it, and an annual topping of leaf mold sustains that humus content.
Temperature
Bloodroot is fully cold-hardy and comfortable from roughly 23°F to 75°F (-5°C to 24°C), spanning USDA zones 3 through 8. It depends on the chill of a genuine winter to set flowers well, so the cold is a requirement rather than a tolerance.
Humidity
Average outdoor humidity is sufficient, so there is no level to manage. Steady soil moisture in spring influences this plant far more than anything in the surrounding air.
Feeding
In good woodland soil it largely feeds itself and seldom calls for more. A light spring topdressing of leaf mold or compost is generally all it requires, with a balanced organic fertilizer reserved for thin, depleted ground.
Pruning
There is nothing to prune. Let the foliage yellow and die back on its own as the plant goes dormant, since it is reclaiming reserves into the rhizome, and lay a thin blanket of deciduous leaf mulch over winter to return organic matter to the soil.
Repotting
Bloodroot is rarely repotted and resents root disturbance. In a container, watch for fading vigor or crowded rhizomes pushing up to the surface, and only at those signs lift and divide it in fall or early spring.
Size & spacing
This is a low groundcover, reaching just 6 to 10 inches (15 to 25 cm) tall. Each clump spreads 6 to 12 inches (15 to 30 cm) wide and slowly knits into a colony, so space plants about that distance apart.
When to plant
Bloodroot follows the calendar of the woods. Set rhizomes out in fall or early spring, look for the white flowers in March and April, and expect the foliage to fade by midsummer as the plant withdraws into dormancy.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Fall or early spring
- Harvest: March to April
Hardiness
USDA hardiness zones: 3–8
Temperature: down to -40°C
Troubleshooting
Pests and disease rarely touch bloodroot, so most concerns trace back to its seasonal biology or a mismatched site rather than an infection. Match what you observe to the cases below before treating for anything. In most instances the plant is simply behaving as a woodland ephemeral should.
Clumps stall and never form a colony
This species is adapted to the cool, moist, shaded floor of a deciduous wood, and it stops advancing when the site runs too sunny or too dry and lean. The second frequent culprit is propagation failure: the seed loses viability the moment it dries, so plants started from dried seed simply never appear. Reset the site to rich, moist shade, and use only fresh seed or fall divisions to build numbers.
Fix:
- Move or establish plants in part to full shade with rich, moist, well-drained soil
- Sow only fresh seed that has not dried out; divide rhizomes in fall or early spring
Foliage fades and vanishes by midsummer
What looks like decline is summer dormancy, the programmed life cycle of a spring ephemeral rather than a pathogen. After flowering, the plant moves its reserves down into the rhizome, lets the leaves senesce, and rests below ground until the next spring. The correct response is to do nothing except keep the soil from drying out completely, which a layer of leaf litter accomplishes by slowing evaporation.
Fix:
- Allow the plant to go dormant; do not dig or discard the rhizome
- Keep soil from baking completely dry by mulching with leaf litter
Toxicity
Regard the entire plant as poisonous. Every part holds sanguinarine and related alkaloids, with the highest concentration in the red sap of the rhizome, and these compounds are toxic to people and animals alike. The same sap burns skin on contact, so wear gloves whenever you dig or divide, and keep cut pieces away from pets and children.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Toxic
A cat that mouths the rhizome or leaves typically responds with drooling, vomiting, and loss of appetite, the gut reacting to the harsh alkaloid sap. Keep any cut pieces well beyond a cat's reach.
Dogs Toxic
A dog that bites into a dug rhizome usually drools and develops stomach upset, sometimes with vomiting, as the alkaloids irritate the digestive tract. The bright sap also stings on contact, so wash a smeared nose or paw promptly.
Horses Toxic
Grazing on the plant can produce colicky abdominal pain and a dull, off-feed horse. The alkaloids that irritate human skin act the same way on a horse's gut lining.
Rabbits Toxic
A rabbit's small body tolerates these alkaloids poorly, so even a single nibble can leave it drooling and refusing food. The entire plant should be considered off-limits.
Livestock Toxic
Cattle, goats, and sheep tend to avoid the bitter foliage, but any animal that does feed on it can develop digestive distress driven by the sanguinarine.
Birds Caution
The irritant sap makes this a poor planting near pet birds, and the rhizome in particular should be kept away from them. Wild birds pay it no attention.
People Caution
No part of bloodroot is edible, and swallowing it can cause burning, nausea, and vomiting. The red sap is escharotic and damages skin tissue, so handle in gloves and keep it away from children.
Wear gloves when cutting or dividing; the red-orange sap stains and irritates skin and eyes, so avoid skin and eye contact and wash after handling.
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
Bloodroot is grown chiefly as the wild species, though one named form appears in shade gardens.
Sanguinaria canadensis f. multiplex (Plena)
A double-flowered selection carrying many additional petals; because the bloom is sterile, it persists noticeably longer than the few days a wild plant's flower lasts.
Companions
Bloodroot thrives among the other plants of the shaded woodland floor, especially ones that take over the space once it goes dormant.
Plant near
Trillium: Shares the same moist, humus-rich, shaded woodland conditions and blooms in the same spring window.
Ferns: Provide shade and cover after bloodroot goes summer dormant, filling the gap left by its dieback.
How to propagate
Two methods increase a bloodroot planting, and they sit at opposite ends of the patience scale: rapid division of the rhizome, or a long wait from fresh seed.
DivisionModerate
Fall or early spring · 1 to 2 seasons
Division of the rhizome is the most reliable route to new plants. Working in fall or early spring while the plant is dormant or just stirring, lift a clump and cut the red rhizome into sections, making sure each piece carries a growth bud, then replant them horizontally just below the surface. Allow a fresh division a season or two to root in before it begins extending into a colony.
SeedDemanding
Sow fresh immediately after collection in late spring/early summer · Several years to flowering
Seed propagation rewards patience and punishes delay. The seed is intolerant of drying, so it has to go into the ground fresh the moment it is collected in late spring or early summer, before it loses viability. Each seed bears a fleshy elaiosome that ants carry off and effectively sow in the wild, and even under ideal conditions a seedling needs several years to reach flowering size.
Myths
The red sap of bloodroot is a gentle, natural treatment you can apply to skin to remove moles or other growths.
Sanguinarine is an escharotic, meaning it chemically burns and destroys living tissue on contact. People who have applied it to the skin have ended up with deep wounds and permanent scarring. The sap is a corrosive irritant, not a home remedy.