Peas grow well with a number of aromatic herbs including cilantro and mint. Leafy greens, such as lettuce and spinach, are excellent garden pea companions as are: Radishes Cucumbers Carrots Beans

Members of the Brassica family such as cauliflower, Brussels sprouts, broccoli and cabbage are all suitable pea plant companions.
These plants also pair nicely with peas in the garden:
Tomatoes
Turnips
Parsnips
Potatoes

They do not like any member of the Allium family, so keep the onions and garlic at bay.

Direct sow the pea in the ground in the early spring after all danger of frost has passed. Space them fairly close together — 1 to 2 inches apart in the row since peas don’t need to be thinned once sprouted. Leave enough room between rows to facilitate picking, and install a support for vining varieties.

Feed the peas with a balanced fertilizer. Peas need phosphorous, but not nitrogen, as they produce their own.

Pick peas frequently as they mature. Actually, shelling peas are at their peak before the peas have filled the pod to bursting.
Snow peas will be fairly flat while snap peas will have distinct peas inside the pod albeit not very large

How to Grow Peas in a Container

pot grown peas require more water than garden grown, possibly up to three times a day. Because of frequent irrigation, the nutrients are leached out from the soil, so fertilization is key to growing healthy peas in a container.

Almost everything in the Leguminosae family, from snap peas to shelling peas, can be container grown; however, you may wish to select a dwarf or bush variety. Peas are a warm season crop, so growing peas in a container should begin in the spring when temperatures warm to over 60 F. (16 C.).

Next, select a container. Almost anything will work as long as you have drainage holes (or make three to five holes with a hammer and nail) and measures least 12 inches across. Fill the container with soil leaving a 1 inch space at the top.

Create a support for the potted pea with bamboo poles or stakes set into the center of the pot. Space the pea seeds 2 inches apart and 1 inch beneath the soil. Water in thoroughly and top with a 1-inch layer of mulch, like compost or wood chips. Keep the seeds in a lightly shaded area until germination (9-13 days) at which time you should move them to a full sun exposure.

Caring for Peas in Pots Keep an eye on whether the plant is too dry and water until the soil is moist but not drenched to prevent root rot. Don’t over water when in bloom, as it may interfere with pollination. Once the peas have sprouted, fertilize twice during the growing season, using a low nitrogen fertilizer. Be sure to protect your container grown peas from frost by moving them indoors.