How to choose the best:
Lettuce

Touch

Lettuce should feel firm and robust, not at all as if its wilting, so avoid any soft or slimy feeling leaves.

If buying by the head, look for a tight, firm head that feels heavy for its size.

See

The leaves should look vigorous, with a bright green color — unless you're looking for red or purple!

Avoid any leaves that seem to be going yellow or brown.

Some more details:

How to store

Lettuce does best in a humid environment, so try simply placing a wet cloth (or paper towel) at the top of the bowl or container.

When it's in season

Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec.