Spinach is most productive grown in cool spring conditions and sown again in late summer for a fall crop. After seedlings reach 2 to 3 inches tall, thin out every other plant (and enjoy in early salads) and keep thinning in this fashion until plants are spaced 5 or 6 inches apart. Keep the shallow-rooted plants well weeded and watered. Spinach is a heavy feeder so fertilize several times with fish emulsion solution for best harvests.
HARVEST AND USE
There are two methods for harvesting spinach: either cut the entire plant 1 inch or so above the base once plants are 4 or 5 inches tall, or wait until plants are well established and harvest just the outer leaves, leaving at least 4 center leaves so plant will continue to grow. Water and fertilize after cutting and plants will provide 2 or 3 pickings before weather gets too warm and spinach begins to go to seed.