Caring for Garden Phlox

Garden phlox has moderate water needs and performs best with consistent moisture, especially during dry spells in summer when it is flowering. Water deeply once or twice a week rather than little and often, directing water at the base of the plant to keep foliage dry and reduce mildew risk. In spring and autumn, rainfall is usually sufficient, but keep an eye on newly planted specimens. Mulching in spring helps retain soil moisture and suppresses weeds. Feed in March and April as new growth appears. Apply a balanced granular fertiliser such as Growmore or blood, fish, and bone around the base of each clump, following packet rates, then water in well. A second, lighter feed in early summer can boost flowering, but avoid overfeeding, which encourages soft, disease-prone growth. Powdery mildew is the most common problem, particularly in dry soil, humid conditions, or where air circulation is poor. White, powdery patches appear on leaves from mid-summer onwards. Improve spacing, water consistently, and remove affected foliage promptly. Resistant varieties such as 'David' or 'Uspekh' are worth seeking out. Slugs and snails may nibble young shoots in spring; use organic pellets or barriers if damage is severe. Garden phlox is fully hardy in temperate Europe and needs no winter protection. Leave stems standing if you wish, or cut back in November. Clumps benefit from division every three to four years to maintain vigour and flowering performance. Lift plants in early spring, tease apart the roots, and replant healthy sections with plenty of compost.