Rubus boysenberry, thornless (F) | thornless boysenberry

RHS

Fruit Edible Shrubs

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The thornless boysenberry is a vigorous hybrid berry with thornless canes spreading up to 2m wide. Small white flowers are borne in spring and the purple-black fruits, tasting like sweet blackberries, ripen in late summer

Position

Full sun

Soil Types

Clay, Loam, Sand

Max Height

1.5-2.5 metres

Max Spread

1.5-2.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 1.5-2.5 metres
Max Height: 1.5-2.5 metres

Growing Conditions

Clay Loam Sand

Moisture: Moist but well–drained or Well–drained
pH: Neutral

Position

Full sun

Aspect: South–facing or North–facing or West–facing or East–facing
Exposure: Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H6

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Rosaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Trailing
Genus: Rubus can be deciduous or evergreen shrubs, often scrambling with bristly or prickly stems bearing simple, lobed, palmate or pinnate leaves and 5-petalled flowers followed by juicy, sometimes edible fruits
Name Status: Unresolved
Horticultural Group

Horticultural Classification Codes

Horticultural Classification Codes are often given to genera which have a large number of species or cultivars. They are used to categorise cultivated plants based on specific, shared characteristics such as shape, colour, size or flowering time, and can be displayed as letters or numbers

For example:
Dahlia ‘Sunset Kate (Sin) = Single flower
Rosa ‘Marigold’ (HT) = Hybrid Tea: This genus produces fruit, but not necessarily edible fruit

How to Grow

Cultivation

Usually fan-trained on free-standing post and wire support systems or can be grown vertically over an arch. Mulch with well-rotted compost or manure

Propagation

Propagate by tip layering or from cuttings

Suggested planting locations and garden types

Cottage and informal garden
Banks and slopes
Hedging and screens

Pruning

Cut out old canes following fruiting and leave new canes tied together with soft string over winter. Untie and train along the support system in the spring. See pruning hybrid berries for more detail

Pests

May be susceptible to aphids, raspberry beetle and gall mites

Diseases

May be susceptible to grey moulds and honey fungus (rarely)