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Boysenberry
Rubus ursinus × idaeus · Berry
40 pairings
The boysenberry is a large, soft, deep maroon-to-purple aggregate berry, a complex bramble hybrid of blackberry, raspberry and loganberry parentage developed in early-20th-century California. Bigger and juicier than a blackberry, it has a sweet-tart, winey, faintly raspberry-perfumed flavour and an intensely staining purple-red juice that has made it a prized fruit for pies, jams, syrups and the theme-park preserves of Knott's Berry Farm.
Picking a good onedrag
UnderripeOverripe
Full maroonGlossy deep maroon and still firm — the one that survives the trip home. Good raw, and the fruit that holds its shape in a pie or a tart.Buy it
ColourDeep maroon right through, still glossy
Give in the handPlump and firm, gives a little
Stem endClean scar, the pale core dry inside
Smell at the punnetSweet dark berry as you lift the lid
What to look for, from underripe to overripe.
What one gives you
96%
Usable yield
Stray caps and soft berries out · blackberry's 4% refuse
Keeping ittap a band
A domestic fridge holds it about 2× longer than the counter.
Humidity
90-95%
Damp air, dry fruit. Never wash the punnet you mean to keep, and keep it off a misted display: free water starts grey mould and can leach colour to red patches.
Airflow
Vented punnet, one layer deep
Get it cold within hours and leave the punnet vented. Sealed while warm it sweats, and mould walks from one burst berry to every berry touching it.
Ripens no further, but mould answers it
Handbook 66 names boysenberry and marks it neither way, so no fruit bowl improves it and it moves nothing else along. But ethylene in the air speeds the grey mould that ends it.