Althaea officinalis is a PERENNIAL growing to 1.2 m (4ft) by 0.8 m (2ft 7in).
It is hardy to zone (UK) 3 and is not frost tender. It is in flower from Jul to September, and the seeds ripen from Aug to October. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Bees. self.The plant is self-fertile.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: acid, neutral and basic (alkaline) soils and can grow in saline soils.
It cannot grow in the shade. It prefers dry or moist soil
Seed - sow spring or autumn in a cold frame. The seed is best sown as soon as it is ripe in late summer, the germination is often erratic. Stratification can improve germination rates and time. Prick out the seedlings into individual pots when they are large enough to handle and plant them out in the summer[K]. Division in spring or autumn. Fairly easy, it is best to pot up the divisions in a lightly shaded position in a cold frame or greenhouse until they are growing away well and then plant them out into their permanent positions. Root cuttings in December.
Edible Parts: Leaves; Oil; Root.
Edible Uses: Egg; Oil; Tea.
Marsh mallow is a very useful household medicinal herb.