Althaea officinalis
marsh mallow
A hardy herbaceous perennial characterised by its softly hairy, grey-green leaves and stems. From mid-summer to early autumn, it produces clusters of delicate lilac-pink, saucer-shaped flowers on tall stems. While Althaea officinalis tolerates a wide range of growing conditions, it thrives in fertile, moist but well-drained soil, preferring a damp position with partial shade though will grow well in full sun. Traditionally found in marshy areas, the marshmallow's thick, long, tapering roots were once used to create the confection we know as marshmallow.
How to care for Althaea officinalis:
Althaea thrives in moist, well-drained soil with plenty of organic matter. It prefers a sunny to partially shaded location and can tolerate a range of soil types, although it does best in rich, loamy soil. When planting, space at 60cm (24in) apart to allow for their spreading habit. Regular watering is essential, especially during dry spells, to keep the soil consistently moist. In late autumn, cut back the stems to 15cm (6in) to encourage healthy growth the following spring. Applying a layer of mulch can help retain moisture and protect the roots during winter. As the plants are tall, they may require staking if they are grown in more exposed positions.
Flowering period:
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
Eventual height:
1.5m
Eventual spread:
0.6m
Position:
Full sun
Rate of growth:
Average
Soil:
Moderately fertile, moist, well-drained soil
Hardiness:
Fully hardy
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This perennial dies back to below ground level each year in autumn, then fresh new growth appears again in spring.
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