Edamame

Edamame is a soybean harvested at a very specific moment — when the pods are plump and bright green but before the seeds inside have hardened into the dry beans you'd grind for tofu. That window is five to seven days, maybe a week if the weather stays cool. Miss it by three days and you're picking soybeans that cook up starchy and bland. Wait a week too long and you have field corn, botanically speaking — tough, mealy, past their prime. Most home gardeners who try edamame once and dismiss it never tasted it at the right stage.

The plant itself is straightforward once the soil is warm. Sow seeds directly about a week after your last frost date, when the soil has reached at least sixty degrees. Edamame transplants poorly — the taproot doesn't like being disturbed — so starting indoors tends to set plants back rather than give them a head start. Push seeds an inch deep, six inches apart, and wait. Germination usually takes a week to ten days.

Before you sow, coat the seeds with a rhizobium inoculant. Edamame is a legume, and like all legumes it forms a partnership with soil bacteria that pull nitrogen from the air and feed it to the plant. In a garden bed that has never grown beans or peas, those bacteria may not be present, and the plants will struggle. The inoculant — a black powder you shake onto damp seeds before planting — seeds the soil with the right strain. Plants inoculated at sowing tend to produce noticeably more pods than those that aren't, and the difference is large enough that skipping this step usually shows up at harvest.

Once the plants are up, leave them alone. Edamame doesn't need heavy feeding — too much nitrogen, in fact, pushes the plant toward leaf growth at the expense of pod set. Water when the top inch of soil is dry, and mulch if you're in a hot climate to keep the roots cool. The plants tend to flower about six weeks after sowing, and the pods begin to fill two to three weeks after that.

Start checking the pods daily once they've plumped up and are still bright green. The beans inside should fill the pod but still feel slightly soft when you press them. If they're hard, you've waited too long. Pick the whole plant when most of the pods are at that stage — edamame doesn't ripen all at once, but the bulk of the crop usually comes within a few days of itself. Boil the pods in salted water for five minutes and serve them warm. That's the window. That's what edamame actually tastes like.