Moerbei

Morus nigra

Engels: Mulberry

fruitMoraceaeEetbaar

Moerbei (Morus nigra) is a edible fruit plant from the Moraceae family that grows up to 8 meters tall. This plant thrives in full sun and requires low maintenance. Blooms in spring with green flowers and attracts birds.

Hoogte

400–800 cm

Breedte

400–600 cm

Zonligging

full sun

Waterbehoefte

moderate

Grondsoort

loam, sandy soil

Onderhoud

low maintenance

Bloeitijd

spring

Bloemkleuren

green

Ecologische waarde

Trekt vogels aan

Verzorgingskalender

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

Planting

Black mulberry (Morus nigra) thrives in full sun and needs a sheltered spot with plenty of space—mature trees can reach 4–8 metres tall and equally wide. Choose a permanent location carefully; mulberries dislike root disturbance and are slow to establish if moved. The ideal soil is well-drained loam or sandy soil with good fertility, though mulberries tolerate a range of conditions provided drainage is adequate. Avoid heavy clay that stays waterlogged in winter. Plant bare-root trees in October, November, or March when the soil is workable and not frozen. Container-grown specimens can go in during the same months for best results. Dig a planting hole twice the width of the root ball but no deeper—the root flare should sit level with the surrounding soil. Break up compacted soil at the base of the hole and mix in a bucketful of well-rotted compost or manure to improve structure and fertility. Position the tree so the graft union (if present) is above soil level. Backfill with the excavated soil, firming gently with your heel to eliminate air pockets. Water thoroughly after planting, applying at least 20 litres to settle the roots. Apply a 7–10 cm layer of organic mulch (bark chips or well-rotted compost) around the base, keeping it clear of the trunk to prevent rot. Space trees at least 5 metres apart and away from paths or patios—ripe mulberries stain badly when they drop. Stake young trees with a short, angled stake and a flexible tie for the first two years until the root system anchors properly.

Pruning

Black mulberry requires minimal pruning and resents heavy cutting, which can lead to dieback or excessive bleeding of sap. The best time to prune is in late autumn or early winter—November or December—when the tree is fully dormant and sap flow is at its lowest. Avoid pruning in late winter or spring, as mulberries bleed profusely from fresh cuts, weakening the tree and inviting disease. For the first few years, focus on establishing a balanced framework. Remove any crossing, rubbing, or inward-growing branches to create an open centre that allows light and air circulation. Cut back to a main branch or the trunk rather than leaving stubs. Use clean, sharp secateurs for stems up to 2 cm diameter and a pruning saw for anything thicker. Once mature, mulberries need very little intervention. Remove any dead, damaged, or diseased wood as you spot it, cutting back to healthy tissue. If branches become congested in the crown, thin out a few of the weakest or most awkwardly placed stems, but never remove more than a quarter of the canopy in one season. Mulberries fruit on short spurs on older wood, so avoid cutting back healthy fruiting branches. Old, neglected trees can be lightly renovated over two or three years, removing no more than one or two large limbs per winter. Always seal large cuts (over 5 cm diameter) with pruning paint to reduce moisture loss and infection risk. If the tree is growing well and fruiting reliably, the best approach is simply to leave it alone.

Maintenance

Black mulberry is low-maintenance once established but benefits from consistent care in its early years. Water newly planted trees regularly from April through September, providing roughly 20 litres per week during dry spells. Established trees are moderately drought-tolerant but fruit quality and size improve with steady moisture during fruit development in June and July. Reduce watering in autumn and winter unless conditions are exceptionally dry. Feed once a year in March with a balanced general-purpose fertiliser (such as blood, fish, and bone) or a controlled-release granular feed, scattering a generous handful around the root zone and watering in. Alternatively, apply a 5 cm layer of well-rotted compost or manure as a mulch in early spring; this feeds the soil, suppresses weeds, and conserves moisture. Avoid high-nitrogen feeds after June, as soft late growth is vulnerable to frost damage. Mulberries are hardy in zones 6a–9b and need no winter protection in temperate Europe. Refresh the mulch layer each spring, keeping it clear of the trunk. The main pest to watch for is mulberry aphid, which causes leaf curl in late spring; a strong jet of water usually dislodges them, or use an insecticidal soap if necessary. Coral spot fungus can appear on dead wood, showing as pink pustules—prune out affected branches promptly and burn or bin them. Birds are fond of ripening fruit; netting is impractical on large trees, so expect to share the harvest. Fruit ripens from July through September and drops when fully ripe, so lay a sheet beneath the tree for easy collection. Mulberries do not store well; use or freeze them within a day or two of picking.