Shrubs🌿 Native to the NetherlandsVery hardy — tolerates frost down to -30°C

Blackthorn

Prunus spinosa

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Blackthorn (Prunus spinosa) is a native, deciduous, and densely branched shrub typical of hedgerows, forest edges, thickets, earth banks, dikes, dunes, river dunes, and calcareous slopes. Its dark branches are armed with sharp thorns. Through vigorous suckering, the shrub can spread to form broad, impenetrable thickets. Numerous white flowers appear in March and April before the leaves emerge. By autumn, the blue-black, pruinose fruits ripen. Blackthorn is ideal for mixed native hedges, landscape plantings, bird sanctuaries, larger wildlife gardens, and embankments. Provide the shrub with ample space and keep in mind its sharp thorns and tendency to spread via root suckers.

Year calendar

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
🌸Blooms
🐝Provides nectar
🍓Bears fruit
🍂Has autumn colour

Pruning period

✂️Best pruning period: Jun–Sep

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
✂️ Pruning period

Best pruning period

Blackthorn requires little pruning. Remove old, damaged, or crossing branches preferably during dry summer weather, as pruning Prunus species in winter can increase the risk of silver leaf disease. Prune thickets in phases rather than all at once, ensuring that young twigs containing the overwintering eggs of the black hairstreak are preserved. Always check for active bird nests before pruning.

Botanical profile

Site & soil

Sun, Half shade

Soil type: Clay, Sand, Loam, Humus-rich

Moisture need: Dry, Moderately moist, Moist

pH: Neutral (6.5–7.5), Chalky (>7.5), Slightly acidic (5.5–6.5)

Nutrient richness: Moderately nutrient-rich, Nutrient-rich

Humus content: Humus-poor, Moderately humus-rich, Humus-rich

Water drainage: Strongly draining, Well draining, Moisture-retentive

Appearance & season

Mature height: 150-500cm

Bloom: Feb-Mar

Autumn colour: The leaves turn yellow to orange-yellow, and sometimes yellowish-brown, before falling. The blue-black fruits may remain on the shrub for some time after the leaves have dropped.

Properties

Salt sensitive: No

Edible: The ripe blue-black sloes are edible, though they taste very sour, bitter, and highly astringent when raw. After being exposed to frost or frozen, they become softer and milder, making them suitable for jam, jelly, syrup, sauce, wine, or liqueur. Remove the stones; the stones, leaves, and bark contain harmful substances and are not edible.

Scent: The flowers have a sweet, almond-like scent with a slightly bitter undertone, which is more noticeable on warm days. This fragrance, combined with early nectar, attracts bees, bumblebees, hoverflies, and other insects.

Ecological value

Blackthorn is an essential host plant for the black hairstreak butterfly, as well as various moths, leaf miners, beetles, bugs, and other insects. Its early-blooming white flowers provide nectar and pollen to bees, bumblebees, hoverflies, beetles, and other pollinators when few other shrubs are in bloom. The dense, thorny branches offer safe nesting sites and shelter for birds. The blue-black fruits are consumed by blackbirds, thrushes, fieldfares, starlings, and small mammals. Fallen leaves, old branches, and the dense thicket provide habitat for spiders, soil organisms, mosses, lichens, and numerous small invertebrates.

Food web & Biodiversity

🐛 Caterpillars & mothsExtremely useful

🐝 Bees & bumblebeesVery useful

🪰 HoverfliesVery useful

🦋 ButterfliesVery useful

🪲 Beetles & insectsVery useful

🐦 BirdsExtremely useful

🐿️ MammalsUseful

🐞 Other animalsVery useful

Blackthorn provides early spring nectar and pollen for wild bees, honeybees, bumblebees, hoverflies, and other insects. The shrub is a vital host plant for the black hairstreak and many moth species. The blue sloes are eaten by birds and small mammals. Dense, thorny blackthorn thickets also offer secure nesting sites and protection for birds, hedgehogs, and other small animals.

Distribution in the Netherlands

Source: NDFF Distribution Atlas / FLORON — period 2020–2026

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