Marshmallow: Sowing, planting and harvest calendar
How do you sow marsh mallow under cover?
Sow marsh mallow, Althaea officinalis, under cover in a clean container with drainage holes and fine seed compost. Shelter makes moisture easier to monitor and protects seeds from heavy rain, although emergence may still be slow. Check the botanical name so you do not confuse it with another mallow.
Moisten the compost before sowing. Scatter seeds over the surface and press gently for contact with the growing medium. Keep them exposed to light rather than burying them under a thick layer. A tray makes monitoring easier, while sparse sowing reduces tangled young roots.
Place in light at a cool to mild temperature, around 10–16°C, away from scorching sunlight through glass. Maintain steady moisture without standing water. If using a cover to retain moisture, ventilate against persistent condensation. Germination may take several weeks or even months, so do not discard the sowing just because nothing appears after a few days.
Label the batch with its date. After emergence, provide air and enough light. Transplant carefully when several true leaves have developed, keeping roots intact. Introduce plants gradually to outdoor conditions before planting into suitable soil.
How to successfully sow marshmallow outdoors?
When does your marsh mallow flower?
How do you harvest marshmallow roots?
