Boysenberry
Rubus × 'Boysenberry'
fruitBoysenberry is a 1920s Knotts Berry Farm hybrid (raspberry x blackberry x dewberry x loganberry) producing huge deep-maroon aggregate berries 8 g each with a soft thin skin and the famous sweet-tart bramble flavor that made the variety a California icon. The trailing thorny canes need a sturdy trellis but reward the effort with one of the most flavorful cane berries in any garden.
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Sun
full sun
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Water
Every 3 days
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Harvest
~13 months
to first harvest
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Difficulty
medium
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Lifecycle
perennial
Comes back every year
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Spacing
5-8 ft in row, 8-10 ft between rows
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Planting Depth
Crown at soil line, same depth as nursery
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Soil pH
5.5-6.5
Growing Details
Soil Type
Rich, well-draining
Hardiness Zones
Zones 6 – 9
When to Fertilize
Once in early spring as canes emerge
Fertilizer
10-10-10 or balanced organic at 2-3 lb per 100 sq ft
🌱 Growing Guide
Plant in full sun on well-drained slightly acidic soil. Set crowns 5 to 8 ft apart in rows 8 to 10 ft apart with the crown at nursery soil depth. Boysenberry is trailing, so build a sturdy 2-wire trellis at 3 ft and 5 ft and tie canes in. Floricanes bear, then die; cut spent canes to the ground in fall and train the new primocanes onto the trellis for next years crop.
Planting Calendar
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Direct sow
Apr 15
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Projected first harvest
Jun 24 · Year 2
JJan
FFeb
MMar
AApr
MMay
JJun
JJul
AAug
SSep
OOct
NNov
DDec
Year 1
✅ Plant alongside
Good neighbors that attract beneficial insects or deter pests
- Garlic — Deters Japanese beetles and aphids
- Tansy — Repels Japanese beetles and ants in the patch
- Yarrow — Attracts beneficial wasps that hunt cane borers
- White Clover — Living mulch in the aisles fixes nitrogen
❌ Keep away from
PotatoTomato
🛡️ Pest & disease prevention
Proactive ways to stop trouble before it starts — tap a name with an arrow for its full guide
Drape fine exclusion netting at first color; pick ripe fruit immediately and refrigerate
Watch for tip wilt; prune 6 in below entry holes and destroy canes off-site
Hand-pick into soapy water; never use pheromone traps which attract more beetles
Remove old fruiting canes promptly, prune for airflow, avoid overhead watering
🌾 Harvest & storage
Boysenberry ripens in mid-June through early July, depending on climate. Pick when berries are uniformly deep maroon-black and slip easily off the receptacle. The thin skin and large size make boysenberries fragile; do not stack berries deep in the picking basket. Eat within 2 to 3 days, or freeze for cobblers and jam (Boysenberry pie is the classic Knotts Berry Farm dish).
🥗 Nutrition & benefits
About 50 calories per 100 g with 5 g fiber, 21 mg vitamin C, and 162 mg potassium. Boysenberries are exceptionally rich in anthocyanins and ellagic acid (more than blueberries by some measures), both linked to anti-inflammatory and neuroprotective effects.
For educational and informational purposes only — HomeSown is not medical, health, or other professional advice. Always positively identify any plant before handling or eating it; some plants, and some parts of otherwise-edible plants, are toxic. Consult a qualified professional before consuming or otherwise using any plant, especially if you are pregnant, nursing, taking medication, or have a health condition.