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Watch Monty Don's video demonstration of how to sow spinach seeds, with advice on the ideal location, soil preparation and spacing.springMore advice on growing vegVideo advice on sowing salad leavesSow lettuce seeds in gutteringHow to sow seeds

The winding trails on leaves are caused by the larvae of a small, dark fly. During summer, the females make little nicks in the leaf surface to lay their eggs. A week later, these hatch into larvae, which tunnel along just under the leaf surface to feed. After 2-3 weeks, the larv...