SPINACH

Beginning about six weeks after planting, pinch off individual leaves as you need them in the kitchen, leaving the central rosette intact.
In spring, long, warm days cause spinach to “bolt” (flower and produce seeds). Unless you plan to save seeds, pull up the plants when you notice them developing a tall central stem. Thoroughly clean, then steam-blanch (which limits their uptake of water and fixes enzymes) and freeze bumper crops.


Read more: http://www.motherearthnews.com/Organic-Gardening/2008-10-01/How-To-Grow-Spinach.aspx#ixzz20l0k9KQB