String beans provide a low-maintenance plant for gardeners and large quantities of beans throughout the growing season. To start healthy plants, grow beans from seed after the last spring frost. Select a sunny location with well-draining soil, and soak the beans before planting to speed up germination.
Prepare the garden bed in a spot that receives at least 6 hours of direct sunlight a day, has well-draining soil and is easy to access for frequent harvests and care.
Dig the soil 6 to 8 inches deep, breaking up large clumps of dirt to make room for growing roots. Add 3 inches of compost or garden soil of the bed to improve the soil, especially if the soil is mostly clay or sand.
Set up a trellis in the bed if the seeds are a pole variety. Anchor the trellis into the ground well so that it can support the weight of the bean plants as they grow and develop.
Fill a small bowl with 1 inch of water. Place the bean seeds in the water six to eight hours before planting to hasten germination.
Form a 2-inch trench for each row of bean plants using a trowel. If using a trellis, the trench needs to run parallel to the trellis. Each row should be 2 to 3 feet apart.
Place the string bean seeds in the trench, with bush varieties spaced 2 inches apart and pole varieties set 4 to 6 inches apart. Cover over the seeds by gently moving the soil with your hand to close the trench.
Water regularly once or twice a week to keep the soil moist. Water more deeply the bigger the plants get. Pull weeds as you see them to keep competition to a minimum.
Help your pole variety vines to find the trellis, if necessary. Guide the vines to the trellis by hand to give them a directional assist and keep them from becoming tangled with other vines.