Vlambloem

Phlox paniculata

Engels: Garden Phlox

perennialPolemoniaceae

Vlambloem (Phlox paniculata) is a perennial from the Polemoniaceae family that grows up to 120cm tall. This plant thrives in full sun to partial shade and requires moderate maintenance. Blooms in summer and late summer with pink, purple, white, red flowers and attracts bees and butterflies.

Hoogte

60–120 cm

Breedte

30–60 cm

Zonligging

full sun, partial shade

Waterbehoefte

moderate

Grondsoort

loam, clay soil

Onderhoud

moderate maintenance

Bloeitijd

summer, late summer

Bloemkleuren

pink, purple, white, red

Ecologische waarde

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Verzorgingskalender

Taak	Jan	Feb	Mrt	Apr	Mei	Jun	Jul	Aug	Sep	Okt	Nov	Dec
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Care tips

Planting

Garden phlox thrives in full sun or partial shade, though flowering is most prolific with at least six hours of direct sunlight daily. Choose a spot with good air circulation to reduce the risk of powdery mildew, a common issue with this plant. The ideal soil is moisture-retentive loam or clay that drains reasonably well; phlox dislikes both drought and waterlogging. Prepare the planting area by digging in plenty of well-rotted compost or manure to improve soil structure and fertility. If your soil is heavy clay, work in some horticultural grit to aid drainage. Plant container-grown phlox in March, April, May, September, or October, avoiding periods of frost or drought. Autumn planting gives roots time to establish before the following summer, but spring planting works equally well if you keep plants well watered in their first season. Dig a hole slightly larger than the root ball and set the plant at the same depth it was growing in its pot. Space plants 45 cm apart to allow for their mature spread and to promote airflow between clumps. Firm the soil gently around the roots and water thoroughly to settle them in. Apply a 5 cm layer of organic mulch such as garden compost or bark chips around the base, keeping it clear of the stems to prevent rot. Water regularly for the first few weeks until new growth indicates the plant is established. In exposed gardens, taller varieties may benefit from staking or the support of neighbouring plants.

Pruning

Garden phlox benefits from two main pruning sessions: one in early spring and another after flowering in late autumn. In March, cut back any old stems you left standing over winter to ground level, clearing away dead foliage before new shoots emerge. This tidying also removes overwintering fungal spores that can cause mildew later in the season. If clumps have become congested, this is a good time to lift and divide them, replanting only the healthiest outer sections. In November, once flowering has finished and foliage begins to die back, cut stems down to around 5–10 cm above soil level. Some gardeners prefer to leave seed heads standing for winter interest and to feed birds, but removing spent stems reduces disease carryover and keeps borders tidy. Use clean, sharp secateurs to make neat cuts. During the growing season, deadheading spent flower trusses encourages a second, lighter flush of blooms and prevents the plant wasting energy on seed production. Snip off faded flower heads just above a set of healthy leaves or side shoots. In early summer, when stems are around 30 cm tall, you can also try the "Chelsea chop"—cutting back one-third to half of the stems by about a third of their height. This technique delays flowering slightly on the pruned stems, extends the overall display, and produces sturdier, bushier growth that is less prone to flopping and mildew.

Maintenance

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.