Squash is a warm-season crop. Sow directly in the garden in late spring or early summer when night temperatures stay above 10C. Work well aged compost and a fertilizer into the soil at label rate. Plant groups of 2-3 seeds every 2 feet. Thin to 1 strong seedling per group. for best flavor pick when squash are 4-6 inches long. Harvest often to keep plants producing through the season.