Spinach is a light-dependent plant, which means that once the days get longer than a certain number of hours (12-13 for most varieties), they'll start to flower. Temperature doesn't matter much, unlike with lettuce that bolts above a certain soil temperature. So summertime spinach is nearly impossible unless you use some kind of blackout material to limit the light hours or receives.

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Well there you go, that makes perfect sense.

Cheers for the input, I am fairly new at this Market Gardening caper