Marshmallow (Althaea officinalis) is a hardy perennial herb valued for centuries in herbal traditions and admired for its tall spikes of soft pink blooms. Known for its soothing properties, it is also a beautiful ornamental addition to herb gardens, borders, and pollinator-friendly spaces. Easy to grow and low maintenance, Marshmallow thrives in moist, fertile soils and provides both beauty and practical use.
Seed Information
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Type: Herb Seeds
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Common Name: Marshmallow, Marsh Mallow
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Genus: Althaea
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Life Cycle: Perennial
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Features: Tall pink flowers, soothing herb, pollinator friendly, low maintenance
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Season of Interest: Summer flowering
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Indoor/Outdoor: Both (outdoor beds, herb gardens, and containers)
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Sunlight: Full sun to partial shade
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Cultivating Difficulty: Moderate
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Watering: Moderate to heavy, prefers moist soil
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Climate: Temperate, Humid Continental, Mediterranean
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Growth Habit: Upright clumping, 3–5 ft tall
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Soil Type: Moist, fertile, well-draining soil
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Soil pH: 6.0–7.5
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Planting Time: Spring after last frost or late summer
Grow Instructions
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When to Plant: Sow indoors 6–8 weeks before last frost or directly outdoors in spring
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Soil: Fertile, moist, well-draining soil enriched with compost
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Sunlight: Full sun to partial shade
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Watering: Keep soil evenly moist, especially in dry conditions
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Spacing: 18–24 inches apart
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Germination: 14–21 days at 65–70°F (18–21°C)
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Bloom Season: Mid to late summer
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Tips: Mulch around plants to retain soil moisture; cut back in fall to encourage strong regrowth the next year