Caring for Michaelmas Daisy

Michaelmas daisies have moderate water needs. During spring and summer, water during dry spells to keep the soil evenly moist but not saturated—aim for a thorough soak once a week rather than frequent light sprinklings. Clay and loam soils hold moisture well, but in prolonged dry weather the plants will flag and become more susceptible to mildew. Reduce watering in autumn as growth slows. Feed in early spring (March or April) with a general-purpose granular fertiliser such as blood, fish and bone or Growmore, scattered around the base at roughly a handful per plant and lightly forked in. A second, lighter feed in early summer can boost flowering on poorer soils, but avoid overfeeding, which encourages soft, floppy growth. Powdery mildew is the most common problem, especially in dry conditions or where air circulation is poor. Lower leaves develop a white, powdery coating from late summer onward. Improve spacing, mulch to retain soil moisture, and remove affected foliage promptly. Resistant varieties are available if mildew is persistent in your garden. Slugs and snails may nibble emerging shoots in spring; use your preferred control method early in the season. Michaelmas daisies are fully hardy and need no winter protection. The clumps can become congested and flower less freely after three or four years. Lift and divide them in March or April, replanting vigorous outer sections and discarding the woody centre. Refresh the mulch layer each spring to suppress weeds and conserve moisture through the growing season.