Blackberry
Rubus fruticosus
Vigorous thorny or thornless canes producing plump, dark berries. Train along wires or a fence and prune fruited canes annually.
Overview
Companion Planting
Marigold
Borage
RaspberryToxicity
Blackberry fruits and leaves are non-toxic to humans, dogs, and cats (ASPCA-listed as safe); thorns can cause physical injury but pose no chemical toxicity.
Planting Tips
1 cm of water per m² equals 10 liters. Use the Watering Calculator for exact amounts.
Care Tip: After harvest, prune fruited canes to ground level and train new primocanes onto supports; mulch around the base to retain moisture and suppress weeds.
Common Pests
Spotted Wing Drosophila (Drosophila suzukii)
Symptoms: Small puncture marks on ripening fruit; larvae inside berries cause soft, mushy spots and premature decay.
Treatment: Apply spinosad-based insecticides at first fruit color; harvest frequently and refrigerate berries immediately.
Prevention: Use fine-mesh netting over plants during ripening; remove and destroy fallen or overripe fruit promptly.
Spider Mites (Tetranychus urticae)
Symptoms: Fine stippling and yellowing of leaves, tiny webbing on leaf undersides, premature leaf drop in severe cases.
Treatment: Spray with horticultural oil or insecticidal soap, targeting leaf undersides; introduce predatory mites (Phytoseiulus persimilis).
Prevention: Maintain adequate watering to avoid drought stress; avoid broad-spectrum insecticides that kill natural predators.
Raspberry Beetle (Byturus tomentosus)
Symptoms: Small brown beetles feed on flowers; larvae tunnel into fruit causing grub-infested, deformed berries.
Treatment: Spray with pyrethrin at the green-fruit stage; hand-pick adult beetles from flowers in the morning.
Prevention: Cultivate soil around canes in autumn to expose overwintering pupae; use pheromone traps to monitor populations.
Common Diseases
Anthracnose (Elsinoe veneta)
Symptoms: Small purple-bordered spots on canes that enlarge into sunken gray lesions; leaves may develop shot-hole patterns.
Treatment: Apply copper-based fungicide or lime sulfur at bud break and again before bloom; prune and destroy infected canes.
Prevention: Ensure good air circulation by proper spacing and trellising; avoid overhead irrigation that keeps foliage wet.
Botrytis Fruit Rot (Botrytis cinerea)
Symptoms: Fuzzy gray mold develops on ripening or harvested fruit, especially in wet weather; flowers may also blight.
Treatment: Remove and discard infected fruit immediately; apply fungicide (e.g., captan) during bloom if weather is persistently wet.
Prevention: Improve air flow through pruning; harvest ripe fruit promptly and avoid leaving overripe berries on the plant.
Cane Blight (Leptosphaeria coniothyrium)
Symptoms: Dark brown to black cankers form at wound sites on canes; affected canes wilt and die back above the lesion.
Treatment: Cut infected canes well below the canker and dispose of them; disinfect pruning tools between cuts with rubbing alcohol.
Prevention: Avoid mechanical damage to canes during cultivation; prune only in dry weather to reduce infection risk at wound sites.