Common Name: Blackthorn Our Royal Horticultural Society Blackthorn (Prunus spinosa ) is a dense prickly native deciduous plant, suitable either as a component in a mixed hedge or as a single species hedge. Blackthorn does have the merit of suckering freely, so preventing hedging from becoming gappy at the bottom.RHS Blackthorn produces masses of snow white salvershaped flowers in March on bare brunches (early spring), before the dark green oval leaves & violet blackthorn in autumn. The blackthorn turns from violet to black as they ripen in autumn. It is tolerant of most soils including coastal, as long as it is not grown in a waterlogged situation. It likes a sunny position & is not suitable for full shade.RHS bare root hedging is a very low cost way of planting a hedge, but is only available to buy & plant when dormant (November March). Orders ahead of 1st November will be stored to guarantee an early delivery date. It should be trimmed in midsummer this helps retain its leaves throughout winter.