Vines bleed if you prune them too late
Prune a grapevine as its buds swell in spring and the cuts can drip clear sap for days, sometimes in a steady trickle. Growers call this bleeding. It looks alarming but usually does the plant little harm, and it is one reason winter, while the vine is dormant, remains the preferred time for the main pruning. A light, pocketable hooked blade knife like this 7.5 cm model makes it easy to keep on top of the job before the sap starts to rise.
