Beans are cold-sensitive plants that die in frost. Start them out right in midspring, when temperatures warm to 65 degrees Fahrenheit. Continue bean plantings through midsummer to increase your snap bean harvest, but always get them in the ground at least two months ahead of frost.
Snap beans need bright sun for eight hours every day, good drainage and rich, moist soil. Find the right site in regard to sun and drainage, then till the top 10 inches of soil. Mix 4 inches of organic compost into the site to provide nutrition and to help maintain moisture content between waterings. Turn 5-10-10 fertilizer into the top 6 inches of soil to increase nutrition.
Snap beans require adequate water to grow and especially during bud formation and pod set. Too much or too little water affects both blooming and bean production. Water the beans once a week with 1 inch of water to keep them healthy. Water the plants in the morning to give them time to dry before nightfall.
Water can't nurture the beans to growth and fruiting on its own. Lay 2 inches of organic compost on the soil around the plants to keep the soil moist and warm and to eliminate weed growth. Feed snap beans with ammonium nitrate -- 33-0-0 fertilizer -- midseason, when the plants bloom. Use 1 cup of fertilizer per 50 feet of row, and water immediately after feeding.