Onions are ready for final storage harvest when about half the plant leaves have turned brown or drooped. Push the rest of the leaves over and pick the onions about a week later. The key to harvesting snap beans is to pick them before the pod shows any seed development. Also, the bean should literally snap when you break it. If they're over the hill, the bean will be rubbery.
Broccoli plants produce a large central head comprised of tightly bound buds.
Ferretti says the head should be harvested before any hint of yellowing appears and before the buds separate. Edible Pod Peas. These crops, known as Chinese peas or snow peas, should be picked when still flat, before the pod reveals the outline of the internal seeds. Edible Pod Peas. Also known as snap peas, Ferretti says these varieties are the sweetest and most tender peas.