Marsh Mallow

Althaea officinalis, or marsh mallow, is a tall, statuesque perennial herb in the Malvaceae family, native to Europe, western Asia, and North Africa. It produces soft, velvety leaves and elegant pale-pink to white flowers resembling hollyhock over a long blooming period. All parts — seeds, flowers, leaves, and root — are edible and have been used in traditional medicine for centuries. It thrives in full sun in moderately fertile, well-drained soil and can reach two metres in height.

Growing

Sow seeds directly outdoors at 1–2 cm depth once the soil has warmed to at least 10 °C. Space plants 40–50 cm apart within the row, with 60 cm between rows. Germination takes 10–15 days. Seeds can also be started indoors and transplanted once night temperatures remain above 5 °C. In subsequent years the perennial root re-sprouts vigorously without resowing.

Care

Water regularly during dry spells, especially in the first season while roots establish. Marsh mallow tolerates moderately poor soils and does not need heavy feeding — excess nitrogen encourages leafy growth at the expense of flowers. Tall stems may need light staking in exposed positions. Cut old stems to the ground in late autumn once frost has killed the top growth.

Harvest

Harvest young leaves and flowers as they open throughout the blooming period. Roots are best harvested from plants in their second year or older once the above-ground growth has died back. Dig carefully with a fork, wash, and peel. Seeds can be collected when the seed heads turn brown and dry.

In the kitchen

Young leaves and flowers can be eaten raw in salads or lightly cooked as greens. The root is traditionally boiled and then pan-fried; it has a mucilaginous texture that thickens soups and sauces. Seeds add a mild nutty flavour to dishes. The mucilage from the root was historically used to make the original marshmallow confection.

Storing

Fresh leaves and flowers keep in the refrigerator for 2–3 days. Dried leaves and flowers keep in an airtight container away from light for up to 12 months. Peeled roots can be dried and stored in a cool, dark place for up to 2 years, or kept fresh in the refrigerator for up to 2 weeks.