How to Grow Beans From Seed

Beans are warm-season legumes that hate cold soil and die at the first frost, so timing is everything. Direct-sow seeds outdoors once all danger of frost has passed and the soil has warmed to at least 60F, which usually means one to two weeks after your last spring frost. In long, hot-summer regions you can plant a second crop in mid to late summer for a fall harvest. Do not start beans indoors to transplant; their roots are brittle and dislike being moved.

Sow bean seeds directly into warm, well-drained soil in full sun, about 1 inch deep and 2 to 4 inches apart. Space rows 18 to 24 inches apart, and set pole varieties at the base of a sturdy trellis, teepee, or netting they can climb. There is no need to pre-soak; just keep the soil evenly moist and expect seedlings to emerge in 7 to 12 days. If your soil has never grown legumes, dusting the seeds with a bean and pea inoculant helps them fix nitrogen from the start.

Beans are among the easiest crops to care for. Give them full sun and steady, even moisture, watering deeply at the base whenever the top inch of soil dries, and mulch to keep roots cool and weeds down. Because beans fix their own nitrogen, skip high-nitrogen fertilizers, which produce leafy plants with few pods; rich, well-drained soil is plenty. Give pole types a trellis to climb, keep bush types weeded, and pick often to keep the plants flowering and productive.

Beans grow well beside plants that deter their pests, draw in pollinators, or make use of the nitrogen they add to the soil. Corn, cucumbers, carrots, and squash are classic neighbors, while onions and garlic are best kept apart. These three companions are especially easy to add in one click:

Harvest snap beans while the pods are young, slim, and tender, no thicker than a pencil and before the seeds inside begin to bulge; for shell and lima beans, wait until the pods feel full and firm. Pick with two hands, holding the vine so you do not tear it, and harvest every two to three days. Frequent picking is the single best thing you can do for your crop: it signals the plants to keep flowering and setting new pods right up until frost.

From crisp green snap beans to creamy shelled limas, beans are one of the most useful crops you can grow. Eat snap beans fresh, steamed, or stir-fried, and can or freeze the surplus. Shell and lima beans are wonderful fresh in succotash and stews, or left to dry on the vine for a pantry staple that stores for a year. All are rich in protein and fiber, and as nitrogen-fixing legumes the plants leave your soil richer than they found it.

• Seeds rotting before they sprout: usually from sowing into cold, wet soil. Wait until the ground is at least 60F and avoid overwatering.
• Lots of leaves but few pods: too much nitrogen. Skip high-nitrogen fertilizer, since beans make their own nitrogen.
• Blossom drop: flowers fall without setting pods during extreme heat above 90F or cold snaps. Keep watering even and wait for milder weather.
• Mexican bean beetles: coppery beetles that skeletonize leaves. Handpick them and their yellow larvae, and plant marigolds nearby to deter them.
• Rust and anthracnose: orange or dark spots on leaves and pods. Space plants for airflow, water at the base, and never handle beans when the foliage is wet.