Here on my country, it was also known as sitaw, it was usually mixed on vegetables soup specially sinigang which is a famous delicacy here on Philippines. Among all vegetables, beans are easy to plant and had short time span to harvest it. It's a creative way to use plastic gallons to plant red string beans since it not only saves space but also helps mother earth.

Your ways of taking care the beans are also organic and excellent since it not only preventing the insects from infecting the plant but also can ensure that the vegetables was clean and organic.