Althaea officinalis (marshmallow)

Marshmallow is a robust herbaceous perennial best known for its long history of medicinal use and its soft, structural presence in the garden. It produces multiple upright stems lined with velvety gray-green leaves, forming a full, substantial plant.

In summer, pale pink flowers appear along the stems, adding gentle color and attracting pollinators without overpowering surrounding plants. Traditionally, marshmallow root and leaves have been used in herbal preparations, especially for soothing applications. In the garden, it performs well in herb gardens, medicinal plantings, and mixed perennial beds where its height and texture add balance. 

WHY GARDENERS LOVE IT

• Traditional medicinal herb
• Soft gray-green foliage
• Pale pink summer flowers
• Strong, upright growth
• Pollinator-friendly blooms
• Hardy and adaptable

 HOW IT GROWS

• Plant type: Herbaceous perennial
• Sun: Full sun to light shade
• Soil: Average to moist, well-drained soil
• Water: Moderate; prefers consistent moisture
• Hardiness: USDA Zones 3–9
• Growth habit: Upright, multi-stemmed, clumping

SIZE & BLOOM

• Height × Width: ~2–4 ft. × 2 ft.
• Flower color: Pale pink
• Bloom time: Summer
• Wildlife value: Bees and pollinators 

PLANTING TIPS

• Plant in full sun for strongest growth
• Water well during establishment
• Mulch to help retain soil moisture
• Allow space for mature width

CARE MADE EASY

• Cut back stems in fall or early spring
• Divide every few years if plants become crowded
• Avoid overly dry soils for best performance
• Minimal fertilization needed 

BEST USES

• Medicinal herb gardens
• Herbal tea plantings
• Pollinator gardens
• Mixed perennial beds
• Cottage and traditional gardens

HOW TO KNOW IT’S RIGHT FOR YOU

Choose Marshmallow if you: 

• Grow plants for traditional herbal use
• Want a sturdy, upright perennial
• Garden in cooler or variable climates
• Appreciate subtle flower color and texture