Pea

Peas are a race against the calendar. They germinate in cold soil, grow through spring, and produce heavily for a few weeks — then the heat arrives and the plants stop flowering. A gardener who waits for warm weather to sow peas usually gets a short harvest or none at all. The window is early spring, when the soil is still cold enough that most other seeds would rot.

Sow as soon as the ground can be worked, typically six weeks before your last frost date. The soil temperature can be in the low forties and the seeds will still germinate, though they may take two weeks to come up. Soaking the seeds overnight before planting tends to speed germination by a few days. Do not soak them longer than twelve hours — they can start to rot if left in water too long.

Peas are legumes and fix their own nitrogen through a symbiotic relationship with soil bacteria. That means they do not need heavy feeding — in fact, too much nitrogen in the soil can cause lush foliage and few pods. A bed that grew a heavy feeder the previous season, with no additional compost added, is often ideal. If your soil has never grown peas before, inoculating the seeds with rhizobium bacteria before sowing can improve the nitrogen-fixing relationship.

Most varieties climb, and trellising them increases yield and makes harvest easier. A simple trellis of twine or chicken wire strung between stakes works well; the tendrils will find it and climb on their own. Bush varieties that stay under two feet tall can be grown without support, but even those tend to produce better when they have something to lean on. Untangling a collapsed pea vine from the soil after a rainstorm is one of the less rewarding tasks in a spring garden.

The harvest window is short — two to three weeks in many climates. Once daytime temperatures are consistently above seventy-five degrees, the plants stop setting new flowers and the existing pods mature quickly. Picking every other day during the peak tends to extend production slightly, as leaving mature pods on the vine signals the plant to stop flowering. The moment the vines start to yellow and dry, pull them and compost them — the roots, left in the soil, will release the nitrogen they fixed for the next crop.

A fall sowing is possible in some climates if timed to mature before the first hard freeze. The calculation is trickier than spring planting — count back from your first fall frost date, add the days to maturity, and sow at that point. Fall peas tend to be less reliable than spring peas, but in a year when it works, the harvest comes at a time when little else is producing.