Klokjesbloem

Campanula persicifolia

Engels: Bellflower

perennialCampanulaceae🇳🇱 Inheems

Klokjesbloem (Campanula persicifolia) is a native to the Netherlands perennial from the Campanulaceae family that grows up to 90cm tall. This plant thrives in full sun to partial shade and requires low maintenance. Blooms in early summer and summer with blue, white flowers and attracts bees and butterflies.

Hoogte

40–90 cm

Breedte

25–40 cm

Zonligging

full sun, partial shade

Waterbehoefte

moderate

Grondsoort

loam, chalky soil

Onderhoud

low maintenance

Bloeitijd

early summer, summer

Bloemkleuren

blue, white

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

Campanula persicifolia thrives in full sun or partial shade, making it a versatile choice for borders and cottage-garden schemes. It performs best in well-drained loam or chalky soil with good structure. Before planting, dig over the site to a spade's depth and work in a generous amount of garden compost or well-rotted manure to improve drainage and fertility, especially if your soil is heavy clay. Plant container-grown bellflowers in March, April or May for establishment before summer, or in September and October for autumn planting. Dig a hole slightly wider than the root ball and set the plant at the same depth it was growing in its pot. Space plants 30 cm apart to allow for their mature spread of 25–40 cm and to ensure good air circulation, which helps prevent mildew. After planting, firm the soil gently around the roots and water thoroughly to settle the plant in. Apply a 5 cm layer of mulch such as garden compost or bark chips around the base, keeping it clear of the crown to avoid rot. This helps retain moisture and suppress weeds while the plant establishes. Water regularly during the first growing season, especially in dry spells, to encourage a strong root system. Campanula persicifolia is fully hardy to zone 3a, so no winter protection is needed in temperate European climates. The plants will develop a clump of narrow, evergreen basal leaves and send up tall flower spikes reaching 40–90 cm in early summer. Avoid planting in waterlogged sites, as bellflowers resent sitting in wet soil over winter.

Pruning

Campanula persicifolia doesn't require heavy pruning, but timely deadheading and seasonal tidying will keep plants healthy and encourage a longer flowering display. The main pruning windows are March and November, though you'll also want to attend to spent flowers throughout the summer. Deadhead regularly from June onwards by cutting back individual flower stems to just above the basal foliage as the blooms fade. This prevents the plant from setting seed and often prompts a second, smaller flush of flowers later in the season. Use secateurs or sharp scissors and cut cleanly to avoid tearing the stems. If you want the plant to self-seed lightly around the garden, leave a few spent stems in place at the end of summer. In November, once flowering has completely finished and the stems have died back, cut all the old flower stalks down to ground level. Remove any yellowed or damaged foliage, but leave the rosette of evergreen basal leaves intact—these will persist through winter and provide the energy for next year's growth. In March, tidy up the clump by removing any winter-damaged leaves or debris that has collected around the crown. This is also a good time to divide congested clumps every three to four years. Lift the plant with a fork, tease or cut the rootstock into sections with healthy shoots, and replant immediately at the original spacing. Division rejuvenates older plants and maintains vigour, ensuring strong flowering stems each summer.

Maintenance

Campanula persicifolia is a low-maintenance perennial once established, but a few seasonal tasks will keep it flowering reliably year after year. Water moderately during the growing season, particularly in prolonged dry spells in late spring and summer when the flower spikes are developing. The plant tolerates some drought thanks to its taproot, but flowering is best with consistent moisture. Reduce watering in autumn and winter, as the plant is dormant and excess moisture can lead to crown rot, especially on heavy soils. Feed in March and April to support strong growth and abundant blooms. Apply a balanced granular fertiliser such as Growmore or blood, fish and bone around the base of the clump, following the manufacturer's instructions. A light top-dressing of garden compost in early spring also provides a slow-release nutrient boost. Avoid high-nitrogen feeds, which promote leafy growth at the expense of flowers. Refresh the mulch layer each spring to suppress weeds and conserve moisture, keeping it clear of the crown. Campanula persicifolia is fully hardy and needs no winter protection in zones 7–9. The evergreen basal rosette will remain visible through the coldest months. Pests are rarely a problem, but watch for slugs and snails in spring, which can damage emerging shoots. Powdery mildew may appear on foliage in dry summers, particularly in crowded plantings; improve air circulation and avoid overhead watering. Rust can occasionally affect leaves; remove and bin infected foliage promptly to prevent spread.