What Are the Moisture Requirements for Malva × clementii Ruby Star ('Jostar')?
Well drained

Malva × clementii Ruby Star ('Jostar') · Malva × clementii Ruby Star ('Jostar')
Thrives in light, moderately fertile, well drained soil in full sun; may need support if grown in richer soils (see staking perennials). Shelter from cold winds in areas prone to frosts. May die back to a woody base in cold winters
Well drained