Whether bush beans or a pole bean variety, growing green beans in your vegetable garden can provide you with an abundant crop. Green bean plants will continue to produce beans as long as you continue to harvest the mature beans. Green bean plants are easy to grow and maintain, particularly if you follow a few simple, but important, steps to ensure your bean plants will develop fast and stay healthy.
Select a location to grow your green beans in your garden that will receive at least 6 hours of direct sunlight every day. The longer duration of daily sunlight you can provide to your green bean plants, the healthier and faster they will grow and produce beans.
Use a soil thermometer to verify that the soil temperature in your garden where you want to grow your green beans is consistently warmed to at least 65 F, preferably 70 F. Green bean plants are considered a warm weather crop, sensitive to frost and cold. If you plant your bean seeds when the soil has warmed to 65 F and above, your bean seeds will germinate faster.
Use a shovel or rototiller to supplement your garden soil with a 1-2-1 fertilizer, such as 10-20-10 mix. You should add 1 cup of fertilizer for every 10-foot row of green bean plants. Green beans grow best when provided a good source of phosphorus, which is what the 1-2-1 balance of fertilizer provides. After your bean seeds have sprouted, reapply the same fertilizer, in the same amount, every two weeks.
If your garden soil is heavy and not well-draining, also work in organic material, like decomposed leaves or straw, when you add your initial fertilizer, until the soil is loose and crumbly. Good drainage for your green bean plants will prevent over-watering, which results in disease and fungus attacking your plants.
Plant your fungicide-treated green bean seeds 1 inch deep and 2 feet apart. Using fungicide-treated beans will decrease your plants' susceptibility to fungus. Planting your green beans with ample space between plants will ensure there will be adequate growing room for your mature green bean plants and that there will be good air circulation among the plants. Poor air circulation causes a decrease in bean yield and increases the potential for leaf fungus and disease to develop.
Water your newly planted green bean seeds and keep the soil moist while the seeds are germinating, but do not over-water, creating soggy soil. Over-watering your soil will cause poor germination and poor growth. Watering using a drip irrigation system is ideal because it keeps the water off the leaves and plants, yet provides moisture to the roots of your bean plants.
Adding mulch around the base of your green bean plants will help keep the soil moist and weeds down.