Ornamental · Ranunculaceae
Marsh Marigold
Caltha palustris
Set it where the ground stays wet to soggy, and marsh marigold gilds the water's edge before the season has properly begun.
Full sun
Every 1–3 days
USDA 3–7
8–24 in · 20–61 cm
Overview
Marsh marigold is the plant that opens the water garden's year, laying a wash of gold along a pond edge or a boggy corner while the rest of the beds are still bare. It belongs to the buttercup family, and it brings that easy, meadow-bright charm to the parts of a garden most plants refuse, turning a damp margin into a feature rather than a problem.
Think of it as the piece that gives a waterside setting its early mood. It settles into constantly moist to wet, humus-rich soil or shallow standing water, so it reads as natural at a pond margin, a bog garden, or a rain garden, drawing the eye down to the water and softening the line where planting meets pool. Placed there, it needs little from you and gives the whole scene a lift.
It suits a low-effort, seasonal rhythm at home. Hardy through hard winters and long-lived, it makes its statement in spring, then quietly bows into summer dormancy before returning the following year. One note for households: the fresh plant is an irritant, so keep it thoughtfully placed away from where pets and children roam.
Care
The short version: give it full sun to part shade and soil that stays wet to soggy all season, in rich, mucky ground at the water's edge, and it fits into an easy seasonal routine with little more than keeping it from drying out.
Light
Marsh marigold takes full sun to part shade and flowers most generously with good light, which makes an open pond edge an ideal spot. In hot-summer regions a little afternoon shade earns its keep, easing the plant into summer dormancy later and holding the foliage longer.
Water
This is the detail the whole planting turns on. The roots want to stay constantly moist to wet, in saturated ground or even shallow standing water, and the plant should never dry out. Let the setting go dry after flowering and it usually slips early into summer dormancy.
Soil
It wants wet, humus-rich, mucky soil of the kind that gathers at a pond edge, and it will happily take shallow standing water. A pH anywhere from 5.5 to 7.5 suits it, so soil chemistry rarely enters into the styling.
Temperature
Cold poses no threat to the display. The plant is hardy down to about -40°F (-40°C) and handles heat to roughly 86°F (30°C), though hot summers tend to draw the curtain on the season early.
Humidity
It thrives in a damp setting, which comes with the wet, marginal spots it favors. High humidity around the foliage suits it, so a place near water asks for nothing extra.
Feeding
Feeding sits lightly in the routine. As growth begins in spring, offer one helping of balanced fertilizer or work in rich compost, and that carries the plant through the season.
Pruning
There is little upkeep to speak of. Snip spent flowers and clear the yellowing leaves as the plant dies back, and take summer dieback as normal, with fresh growth returning from the crown the following spring.
Repotting
Lift and divide clumps every 2 to 3 years, or sooner if flowering thins, the roots fill the pot, or the crown starts lifting above the soil. Keep any divisions wet while they settle back into the setting.
Size & spacing
Plants reach about 8 to 24 inches (20 to 61 cm) tall and spread to roughly 12 to 18 inches (30 to 46 cm) across, forming a neat mound that reads well at the water's edge.
When to plant
Marsh marigold keeps an early calendar, and it shapes the mood of a waterside setting from the season's first weeks. It breaks dormancy and flowers in early to mid spring, among the first plants to bloom, then often dies back through summer. Plant it in spring or fall in wet ground, and sow seed fresh in late summer to fall.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: Sow fresh seed in late summer to fall; cold stratification improves germination
- Plant: Spring or fall, in wet soil or pond margins after frost
- Harvest: Early to mid spring (April to June), one of the earliest spring bloomers
Hardiness
USDA hardiness zones: 3–7
Temperature: down to -40°C
Troubleshooting
Marsh marigold gives a garden very little to fret over, and what does come up nearly always traces back to soil that dried out. Learn to read a normal summer rest against genuine trouble and you will seldom need to intervene. Match the picture below before you act.
Plant wilts, fades, or never comes back
A plant that sags or fails to reappear is almost always telling you the ground went too dry. This is a bog plant at heart, its roots asking to stay constantly moist to wet, and a dry stretch will diminish it or lose it altogether. Give it a home at a pond margin, bog garden, or rain garden, water often enough to keep the setting saturated, and mulch to hold that moisture close.
Fix:
- Move or replant at a pond margin, bog garden, or rain garden where soil stays wet
- Water frequently to keep the soil saturated
- Mulch to retain moisture
Leaves yellow and die back in summer
When the foliage yellows in summer, read it as summer dormancy rather than decline. Having carried the water garden through its early season, the plant simply steps back to rest, and a dry or hot-summer setting nudges it off stage sooner. Let it stay in place, keep the ground wet, and clear the faded leaves once the crown has quieted for the year.
Fix:
- Leave the plant in place and let foliage die back naturally
- Keep the soil wet to prolong the foliage and reduce stress
- Tidy away yellowed leaves once they have withered
White powder or rusty spots on the leaves
A pale, powdery bloom on the leaves marks powdery mildew, while orange-brown spots point to rust, and both arrive when the air hangs still over a crowded planting. Remove the marked leaves, give the clump room to breathe, and keep water off the foliage as evening comes on. Past these two, the plant asks for no real worry over pests or disease.
Fix:
- Remove and dispose of affected leaves
- Improve air circulation around the clump
- Avoid wetting foliage late in the day
Toxicity
The whole plant is toxic while fresh, which is worth keeping in mind as you place it in a shared garden. As a buttercup-family member it holds protoanemonin, an irritant released when the leaves or stems are crushed or chewed, and it can blister the mouth and skin and upset the stomach. The bitter, burning taste usually stops an animal from eating much, but site the fresh plant clear of pets, livestock, and children all the same.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Toxic
A cat that samples the fresh plant meets a sharp, irritant sap and tends to retreat quickly. Look for drooling, pawing at the mouth, vomiting, and loose stool.
Dogs Toxic
A dog that chews the leaves or stems is often left drooling and uninterested in food, with vomiting or diarrhea following. The acrid, blistering taste keeps most dogs from eating a great deal.
Horses Toxic
The fresh plant stings the mouth and unsettles the stomach, so a grazing horse rarely goes beyond a single bite. Dried into hay, the protoanemonin breaks down and the concern falls away.
Rabbits Toxic
Not one to offer a rabbit. The same protoanemonin that troubles other animals blisters a rabbit's mouth and upsets its gut, so keep the fresh plant well out of reach.
Livestock Toxic
Cattle, goats, and sheep can suffer blistered lips and stomach upset from the raw plant, though the bitter taste usually turns them away from grazing it. Cured into hay it loses its edge and poses no problem.
Birds Toxic
Best regarded as unsafe around birds. The crushed plant gives off the same caustic compound that troubles mammals, so there is no reason to allow a bird near it.
People Caution
Never eat any part raw. The fresh sap can blister the mouth and skin, so wear gloves when cutting it, though thorough boiling breaks down the toxin and the cooked young leaves and buds have long been eaten.
The raw plant is toxic and irritant: the same protoanemonin found in buttercups and clematis. Cooking (boiling) destroys the protoanemonin, and cooked young leaves and flower buds have historically been eaten - never eat any part raw. The sap can irritate skin, so wear gloves when handling or cutting.
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
Beyond the wild golden form, a couple of selections bring a different accent to a waterside planting. These are the two to know.
'Flore Pleno' ('Multiplex')
A double-flowered form whose crowded petal-like sepals build full, rounded golden-yellow blooms for a richer waterside display.
var. alba
A white-flowered form that sets clean white petals around a yellow center for a cooler, quieter palette.
How to propagate
You can build up a waterside drift by dividing a clump or sowing seed, and division is the faster, surer way to fill a margin.
DivisionEasy
Early spring or late summer after flowering · One growing season
Division is the graceful and dependable route. Lift an established clump in early spring or late summer once flowering is done, part the crown into pieces, and reset each in wet ground. Kept soaking wet, the divisions ease in over a single growing season.
SeedModerate
Sow fresh seed in late summer to fall · Several months to a year; may self-seed in suitable wet sites
Seed rewards a patient hand. Sow it fresh in late summer to fall, letting a cold winter do the coaxing that breaks dormancy and starts it growing. Young plants take several months to a year to find their place, and where the ground stays wet the marsh marigold often self-seeds and fills in on its own.
Myths
Marsh marigold and true cowslip are the same plant.
They carry the old name cowslip in common, yet they belong to different families. Marsh marigold is Caltha palustris in the buttercup family, and true cowslip is Primula veris among the primroses. That shared name is the whole of their kinship, so the botanical name is the one to trust when it counts.
Marsh marigold is a safe wild green to forage and eat.
Raw, it is a buttercup-family irritant rich in protoanemonin, and it can blister the mouth. Only the young leaves and flower buds, boiled well, have any history at the table, since cooking undoes the toxin. No part is safe to eat raw.