Granny’s Bonnet are easy to manage and perform best in rich soils that are moist but well-drained and can be grown in sun or partial shade. During the first year water regularly until established. Remove seed heads before they disperse their contents, otherwise the parent plant may be crowded out by its own offspring. Save the seed and sow it fresh if you want more plants elsewhere, and remove faded flower spikes after flowering. Feed once a month with a balanced liquid fertiliser during the growing season.