Here's a rundown of how to tell when they're ready. Cut before the tip of the spear begins to open. Pull roots when they are 1 to 3 inches in diameter. Cut below the head once it is firm and solid and from 4 to 12 inches in diameter. Harvest when the curd is snowy white and firm and before the buds begin to loosen.
Length depends upon selection.
Cut off the head when it is softball size or larger. Cut when 3 to 5 inches long. Get them while they are small. Harvest Tips Use damaged vegetables immediately. Sometimes tomatoes will crack after a heavy rain, or birds will peck ripe produce.