Kalmia

Kalmia latifolia

Engels: Mountain Laurel

shrubEricaceaeWintergroen

Kalmia (Kalmia latifolia) is a evergreen shrub from the Ericaceae family that grows up to 300cm tall. This plant thrives in partial shade and requires low maintenance. Blooms in late spring and early summer with pink, white flowers and attracts bees and butterflies.

Hoogte

100–300 cm

Breedte

100–250 cm

Zonligging

partial shade

Waterbehoefte

moderate

Grondsoort

peat soil, loam

Onderhoud

low maintenance

Bloeitijd

late spring, early summer

Bloemkleuren

pink, 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

Mountain laurel thrives in partial shade, making it ideal for woodland gardens, shrub borders, or north- and east-facing positions where it receives dappled light or morning sun. Avoid full sun, which can scorch the evergreen foliage, and deep shade, which reduces flowering. Soil preparation is critical. As a member of the Ericaceae family, mountain laurel demands acidic, humus-rich soil with a pH between 4.5 and 6.0. If your soil is neutral or alkaline, incorporate generous amounts of ericaceous compost or peat substitute before planting. The soil should be moisture-retentive yet free-draining; heavy clay needs improving with coarse grit and organic matter, while sandy loam benefits from added leaf mould or well-rotted compost. Plant container-grown specimens in March, April, May, September, or October. Dig a hole twice the width of the root ball but no deeper—mountain laurel has shallow, fibrous roots that should sit at the same level they were in the pot. Planting too deep encourages stem rot. Space plants 200 cm apart to allow for their mature spread of 100–250 cm. After planting, water thoroughly to settle the roots and eliminate air pockets. Apply a 5–8 cm layer of acidic mulch such as pine bark, composted pine needles, or chipped bark around the base, keeping it clear of the stem. This conserves moisture, suppresses weeds, and gradually acidifies the soil as it breaks down. Avoid disturbing the soil around the roots in future; mountain laurel resents root disturbance and benefits from an undisturbed mulch layer that mimics its natural woodland floor habitat.

Pruning

Mountain laurel requires minimal pruning and naturally develops an attractive, rounded shape without intervention. If you need to prune for size control, to remove damaged wood, or to improve the plant's structure, do so in March or April, immediately after flowering finishes in early summer but before new growth hardens off. Use clean, sharp secateurs for stems up to 2 cm thick and loppers or a pruning saw for older, thicker branches. Mountain laurel tolerates hard pruning if necessary—even cutting back into bare wood—but recovery is slow, so avoid drastic cuts unless the plant has become severely overgrown or leggy. Focus on removing dead, diseased, or frost-damaged branches first, cutting back to healthy wood or a main stem junction. Then thin out any crossing or inward-growing stems to open up the centre and improve air circulation, which helps prevent fungal issues in damp conditions. If the shrub has become too tall or wide, selectively shorten the longest stems by up to one-third, cutting just above an outward-facing bud or side shoot to encourage a natural shape. Deadheading spent flower clusters in late June or early July is more important than structural pruning. Use your fingers or secateurs to snap off the faded blooms just above the emerging new shoots below. This prevents the plant from putting energy into seed production and encourages better flowering the following year. Be gentle—the new growth buds form directly beneath the old flower heads, and damaging them reduces next year's display. Avoid autumn or winter pruning, which removes flower buds and exposes tender new growth to frost.

Maintenance

Mountain laurel has moderate water needs and dislikes both drought and waterlogging. Water regularly during the first two growing seasons to establish a deep root system, particularly in dry spells. Once established, water during prolonged dry periods in spring and summer, especially if planted in free-draining soil. The shallow root system dries out faster than deep-rooted shrubs, so check soil moisture 5 cm down and water thoroughly when dry. Reduce watering in autumn and winter unless conditions are exceptionally dry. Feed in March and April with a slow-release ericaceous fertiliser formulated for acid-loving plants, scattering it evenly around the root zone and watering in well. Avoid general-purpose or high-nitrogen feeds, which can damage the roots and reduce flowering. A second light feed in early June supports flowering, but don't feed after mid-summer—soft new growth won't harden off before winter. Refresh the acidic mulch layer each spring, topping it up to 5–8 cm. This is especially important if your soil is naturally neutral, as mulch breakdown helps maintain acidity. Mountain laurel is fully hardy in zones 4a–9b and needs no winter protection in temperate Europe, though evergreen foliage may bronze slightly in cold winters—this is normal and greens up in spring. Common problems include vine weevil, whose larvae eat roots; check for notched leaf edges and treat with biological controls in late summer. Leaf spot fungi can occur in wet, humid conditions—improve air circulation and remove affected leaves. Chlorosis (yellowing leaves) indicates alkaline soil; apply chelated iron and mulch with ericaceous compost to restore acidity. Mountain laurel is generally low-maintenance once its soil and moisture needs are met.