Grow a classic medicinal herb with certified organic Marshmallow seeds. Althaea officinalis, a member of the Mallow family (Malvaceae), is a herbaceous perennial native to Europe. Valued for centuries in traditional herbalism, its nutrient-rich root has been used for digestive support, immune wellness, and soothing irritated tissues. This adaptable plant adds structure, biomass, and botanical beauty to healing gardens and permaculture systems alike.

Marshmallow thrives in full sun to partial shade and prefers consistently moist, fertile soil. Germination typically occurs in 714 days. To encourage strong germination, gently scarify seeds with fine sandpaper before sowing. Sow in spring directly in the garden or start in potsbarely cover with soil, tamp lightly, and keep the surface evenly moist. Mature plants can reach up to 4 feet tall and produce soft green leaves with pale pink hibiscus-like blooms in mid to late summer.

Space plants 1824 inches apart for best growth. Marshmallow produces significant above- and below-ground biomass, enriching soil structure while attracting pollinators with its blooms. Roots are typically harvested in the plants second or third year for herbal use.

This hardy perennial is suitable for USDA Zones 3 to 9 and requires only moderate care once established. A great fit for herbalists, homesteaders, and organic gardeners seeking resilient, multifunctional plants that support both health and soil vitality.

Marshmallow (Althaea officinalis)

Perennial Hardy in Zones 39

Soil Temperature: 6575F
Planting Depth: Barely cover
Germination: 714 Days
Height At Maturity: Up to 48″
Days To Maturity: Second Year Root Harvest
Sun/Shade: Full Sun to Part Shade
Spacing After Thinning: 18″24″
Approx Seeds per Pack: 100 Seeds