How to choose the best:
Watercress

Touch

Look for nice robust leaves, and avoid any leaves that seem to be wilting, soft or slimy at all.

See

The leaves should look vigorous, with a bright green color.

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

Some more details:

How to store

Arugula does best in a humid environment, so simply place 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.