If astilbe leaves are curling and turning brown, this is usually drought stress. Astilbe need very moist soils in shady spots. Water consistently to keep soil moist (not soggy); add organic mulch to keep the roots cool and moist. Water the plant regularly and only allow the top one inch of the soil to dry out between irrigations.
If astilbe leaves are curling and turning brown, this is usually drought stress. Astilbe need very moist soils in shady spots. Water consistently to keep soil moist (not soggy); add organic mulch to keep the roots cool and moist. Water the plant regularly and only allow the top one inch of the soil to dry out between irrigations.