Potting soil is best for growing beans because of its loamy nutrient-rich composition. Nonetheless, beans will grow in clay or sandy soils as long as proper care is taken throughout the growing process.
Most beans are hardy enough to grow in various types of soil, but a sunny location is required. Seeds should be planted in fairly warm soil (about 60 degrees) that is loose and deep enough to allow the roots to stretch and continue lengthening. Potting soil or loam is the best choice for growing beans.
Most potting soils contain added compost, manure and a variety of soil types to improve drainage. Beans require good drainage to prevent a build-up of mold, rot or disease. With plenty of sunshine, rich nutrients and proper watering, beans will flourish throughout the warm months of the year.
Ideal conditions are not always in place, but gardeners can make adjustments to grow a good bean crop in less-than-ideal soils. Clay tends to be dense and it holds water well, although it can be too moist for some bean varieties. Soil with an ample amount of clay needs to be tilled thoroughly and mixed with compost to keep it loose enough for water to pass through. Clay soil is typically the least desirable for plants and vegetables that need good drainage.
Sandy soil is loose and provides good water drainage, but it can be so loose that water washes away too quickly and takes nutrients along with it. This type of soil should be monitored closely to prevent drying, and organic materials, such as compost or manure, should be added occasionally to restore nutrients.
Overall, beans are hardy and fairly easy to grow. With proper care, beans can flourish in a variety of soil types.