Provide the Madeiran cranesbill with sun in the morning and shade in the afternoon. This lighting most closely mimics its natural habitat.
Water the Madeiran cranesbill just enough to keep the soil barely moist. The plant is able to survive for months without water, according to specialists with the Botanical Conservatory at the University of California at Davis, but a little water helps keep it looking its best.
Fertilize the Madeiran cranesbill with a formula listed for use on acid-loving plants, such as azaleas. Follow the instructions on the label and fertilize only once, in spring.
Use pruning shears to cut the cranesbill back to the soil after flowering.