Let lettuce help your peas.
Peas and other shallow-rooted crops can be damaged easily by cultivating the surrounding soil. That's why broad-leaved weeds can easily overtake them. So why not establish an edible, living mulch to fight the weeds and provide an extra early-season crop? Sow seeds of a fast-growing leaf lettuce thickly between young pea plants. The lettuce will outperform the weeds, and you can harvest the lettuce thinnings as you pick your peas.
Photo: (cc) Buck/Flickr