astilbe 'Zuster Theresa'

Grow in moist, fertile, humus-rich soil in full sun or grow in partial shade where soil is likely to dry out in the summer. Plants must be divided every three to four years to maintain vigour

Can cut back after flowering, or delay until spring as faded flower spikes can remain attractive in autumn and winter

Propagate by division in late winter or early spring, pot divisions under glass and plant out in late spring

Generally pest free

Powdery mildews and a leaf spot may be troublesome