String beans, more commonly called green bush beans, are warm-season vegetables that are easy to grow in the home garden. Unlike pole beans, string beans require no climbing supports and instead grow in a bush form. String beans are usually planted and grown from seed in the springtime, producing heavy crops throughout the summer. The great feature of these beans is that if you continue to remove the bean pods before the seeds mature, the string bean plants will continually form new flowers and grow more beans.
Select a planting site for your string beans that's in full to partial sunlight and has deep, well-draining, fertile soil. Plant your string beans in the spring, after all danger of frost has passed and the soil has warmed up to 65 to 70 degrees F.
Remove all grasses, weeds or other debris from the planting site and loosen the soil to a depth of about 6 to 12 inches using a pitchfork or rototiller. Work into the top 6 inches a granular 10-20-10 NPK (nitrogen-phosphorous-potassium) fertilizer according to the dosage instructions on the label.
Plant the string bean seeds 1 inch deep into the soil, spaced about 2 to 4 inches apart in rows that are 1 1/2 to 2 feet apart. Thin out the weakest string bean seedlings when they reach about 3 inches tall, spacing them about 3 to 4 inches apart in the rows.
Water your string beans once each week in the absence of adequate rainfall to ensure the plants receive at least 1 inch of water per week. Water directly at the roots, instead of "showering" the plants and wetting the foliage, to keep the soil evenly moist at all times.
Remove all weeds from around your string bean seedlings by hand-pulling or hoeing the weeds very shallowly. After the string bean plants are about 5 inches tall, you can spread a 2- to 3-inch layer of mulch around the plants to control weeds.