The two basic types of lemons are acid and sweet. The acidic types are the most commercially available. The sweet types are grown usually by home gardeners.
Peak April through August.
Lemons should be firm, glossy, and bright yellow. Heavy fruits with fine-grained skin are juiciest. Avoid hard, shriveled, spongy, and soft lemons.
Lemons will keep for two weeks without refrigeration. Store in a plastic bag in the refrigerator crisper for up to three weeks.