Marshmallow (Althaea officinalis) Seeds

Marshmallow (Althaea officinalis) is a classic marshland perennial known for its soft, velvety foliage and elegant pale pink blooms. Its tall stems and airy flowers bring a gentle, cottage-garden look to borders, water edges, wildflower gardens, and naturalized plantings. Thriving in moist and clay soils that many plants avoid, Marshmallow supports bees and other beneficial insects while adding height, texture, and softness to ecological and ornamental landscapes.

Features

• Soft, pale pink flowers with elegant upright growth.
• Attracts bees and beneficial pollinators.
• Thrives in wet or clay soils where many perennials struggle.
• Tall, airy perennial ideal for wildflower gardens and borders.
• Velvety foliage adds unique texture in ornamental beds.
• Non-GMO Althaea officinalis seed variety.

Specifications

• Common Name: Marshmallow
• Scientific Name: Althaea officinalis
• Plant Type: Perennial flowering herb
• USDA Zones: 3–8
• Bloom Color: Pale pink
• Bloom Season: Summer into early fall
• Height: 48–72 inches
• Spread: 18–36 inches
• Growth Habit: Tall, upright, clumping
• Foliage Texture: Soft, velvety leaves
• Heirloom: Yes
• GMO Status: Non-GMO
• Organic: Not certified organic
• Light Requirements: Full sun to partial shade
• Soil Preference: Moist, wet, or clay soils; tolerates average soil
• Water Needs: Moderate to high (prefers moisture)
• Pollinator Friendly: Yes (bees, beneficial insects)
• Maintenance Level: Low
• Plant Spacing: 18–24 inches
• Seed Viability: 2–3 years stored cool & dry

Planting Guide

• Sow indoors 6–8 weeks before final frost or direct sow outdoors in spring or fall.
• For best germination, scarify seeds lightly (nick or sand gently).
• Cold stratify for 4–6 weeks (refrigerate in moist medium).
• Sow seeds 1/4 inch deep in moist, well-drained soil.
• Keep soil evenly moist until germination (10–28 days).
• Transplant after frost into full sun or partial shade.
• Provide consistent moisture, especially during establishment.
• Allow plants space for height and clumping growth.
• Leave seedheads to feed wildlife and encourage reseeding.