Marshmallow
Althaea officinalis
Marshmallow is a soft, downy wetland perennial whose mucilage-rich roots once gave the original marshmallow confection its name. It remains a gentle soothing herb for sore throats and irritated tissue.
- Light
- Full sun to part shade
- Water
- High; prefers moist soil
- Difficulty
- Easy
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Overview
Marshmallow (Althaea officinalis) is a perennial herb in the mallow family (Malvaceae), native to the salt marshes, damp meadows and riverbanks of Europe, North Africa and western Asia.
Its roots, leaves and flowers are rich in mucilage, a soft slippery substance that soothes irritated tissue. This made it a classic herbal demulcent for sore throats, coughs and digestive discomfort.
Its most famous legacy is culinary: French confectioners once whipped the sweetened root sap into the original marshmallow sweet. Modern marshmallows use gelatin instead, but the name endures.
How to identify it
- Flowers: pale pink to white, five-petaled, about 3-5 cm across, clustered in the upper leaf axils in summer
- Leaves: soft, grey-green, velvety and downy on both sides, ovate with shallow lobes and toothed edges
- Stems: erect, downy, 1-2 m tall
- Roots: thick, white, fleshy taproot full of slippery mucilage
- Habit: clumping perennial with a soft, hairy overall texture
Care & growing
Light: Full sun to partial shade.
Water: Prefers consistently moist soil and tolerates damp, even occasionally waterlogged, ground; reflects its marshland origins.
Soil: Moist, fertile soil; tolerates some salinity.
Temperature: Hardy through about USDA zones 3-9; dies back in winter.
Feeding: Light feeding or compost in spring is plenty.
Propagation: Sow seed (cold stratification helps) or divide established roots in autumn; harvest roots in autumn of the second year or later.
Habitat & origin
Native to Europe, North Africa and western Asia, marshmallow grows in salt marshes, the upper edges of tidal flats, damp meadows, ditches and riverbanks. It has naturalized in parts of North America.
Gardeners grow it in moist borders, bog gardens and herb beds, choosing damp sites that suit its wetland nature.
Uses & benefits
Medicinal: A classic demulcent herb; root and leaf preparations form a soothing mucilage used traditionally for sore throats, dry coughs and irritated digestive or urinary tissue.
Culinary: The root sap was the basis of the original marshmallow confection; young leaves and roots are edible, and flowers garnish salads.
Ornamental: Soft grey foliage and pale flowers suit cottage and pollinator gardens.
Ecological: The flowers attract bees and other pollinators.
Frequently asked questions
Is this plant where marshmallows come from?
Yes, originally. The confection was first made from the sweetened, whipped mucilage of the marshmallow root, though modern marshmallows are made with gelatin and no longer contain the plant.
How is marshmallow used medicinally?
Its roots and leaves are rich in soothing mucilage, traditionally used as a demulcent for sore throats, coughs and irritated digestive tissue, typically as a tea or cold infusion.
Can you eat marshmallow root?
Yes, the roots, young leaves and flowers are edible. The roots are starchy and mucilaginous and have a long history as both food and medicine.
What growing conditions does marshmallow need?
As a marsh plant it likes consistently moist, fertile soil in sun or part shade and tolerates damp, even slightly salty, ground.
Marshmallow guides
In-depth guides for identifying, growing, and caring for Marshmallow.
