Marshmallow (Althea officinalis) 100 seeds

Description

Marshmallow (Althaea officinalis) – Planting & Care Guide

• Habit/Hardiness: Perennial, USDA zones 3–9; 3–5 ft tall; pollinator friendly.
• Light: Full sun to light shade (best bloom in sun).
• Soil: Deep, moisture‑retentive, well‑drained loam; tolerates clay if not waterlogged.
  • pH 6.0–7.5. Work in 2–3 in (5–7 cm) compost before planting.
• Moisture: Keep consistently moist; avoid drying out, especially first year. Mulch 1–2 in, off the crowns.
• Spacing: 18–24 in (45–60 cm).
• Planting: Set crown at soil level; spring or early fall. Water in well.

From seed

• Stratify: Cold‑moist chill 3–4 weeks for best germination.
• Sow: Indoors 6–8 wks before last frost or direct‑sow after frost. Cover 1/8 in (3 mm). 65–70°F (18–21°C). Germination 10–20 days.
• Transplant: When 2–3 true leaves; handle gently (developing taproot).

Water & Feeding

• Water: Regular, deep watering; do not let fully dry. More tolerant once established but prefers even moisture.
• Feed: Light feeder—compost at planting; optional balanced, slow‑release in spring.

Care

• Pinch young tips to encourage bushier growth (optional).
• Stake in windy sites.
• Cut back dead stems in late fall or early spring.
• Divide or take root cuttings in early spring if needed.

Containers

• Large, deep pot with drainage; rich potting mix with 20–30% perlite. Keep evenly moist.

Pests/Diseases

• Generally easy. Watch for rust/leaf spots in humid weather; improve airflow, avoid overhead watering. Rarely aphids/Japanese beetles—rinse or handpick.