Prepare the soil for planting. Edamame beans grow best in loose, slightly acidic soil. They will grow in almost any soil condition but they prefer the soil to be at a pH level of 5.8 to 7. Texas is notorious for having bad soil for vegetable growth. Use a fertilizer designed for vegetables to help prepare the soil for planting.
Create rows of furrows in the soil that are one inch deep and three inches apart. Insert the seeds into the holes and cover them with soil. The seeds must be planted when the Texas climate is about 50 to 60 degrees Fahrenheit.
Water the beans two to three times per week to combat the dry Texas heat. Fortunately, edamame beans have a very deep root, which makes them resistant to periods of drought.
Harvest the beans when you notice the leaves have fallen from the plant. Another good indication that the beans are ready is that when you shake the beans, you can hear them rattle around in the pod.