Buying and storing
Whichever size you chose, look for firm, brightly coloured spears with tightly closed tips.
Asparagus begins to lose its sweetness as soon as it's picked, so try to cook it as soon as possible after you buy it. Local asparagus is best, as there's less time between when it's picked and when it reaches the market.
If you do plan to store asparagus in your refrigerator for a few days after you buy it, treat it like a bouquet of flowers: trim a small amount from the bottoms of the spears with a sharp knife and place them in a tall glass with a little water in the bottom. Cover the top loosely with a plastic bag, and store in the fridge. This will keep the spears firm and crisp until you are ready to cook them.