Althaea Rosea is the common Hollyhock. There are single and double varieties. Althea is a giant flower garden, its tall spires of large, funnel-shaped flowers providing Summer colour in cottage gardens.
Germination Temperature (°F)
Sow seeds in trays of seed compost. Put each seed 1/4 below compost. Place tray in well lit position and keep compost moist.
Take cuttings in Autumn or sow seeds in June. Sow annual varieties under glass in February.
Althea Rosea can be grown as a perennial but rust disease soon ruins older plants. It is better to grow it as a biennial or to grow annual varieties the Majorette or the Summer Carnival.
Deadhead Althea at the base of the flower spike as soon as they are spent. This discourages seed-making and encourages re-flowering the next season.
Althaea thrives in a sunny, sheltered spot. Stake on exposed sites.
Any garden soil.
Watering is necessary when transplanting, but be careful not to over water.