Their relatively large size and rapid pace of development make bean plants a good choice for a child's first garden. Watching beans grow provides an opportunity for children to learn about the parts of a plant, the stages of plant growth, and the things that bean plants--as well as many other plants--need to grow.
Beans take nutrients in through their roots. Hydroponic plants absorb nutrients from the solutions they're planted in, but most plants derive nutrients from the soil. The three most important nutrients for plant growth are nitrogen, phosphorus and potassium. Fertilizers help supply nutrients that soil may be lacking. You can mix a dry fertilizer with the soil before you plant your bean seeds, or feed it with a liquid fertilizer several times during the growing season.
Beans need water in order to process nutrients in the soil. Beans prefer moist but not soggy soil. If the soil dries out, beans will stop growing and eventually will shrivel up and die. If there's too much soil, the roots can rot and the plant will die.
The chlorophyll that makes bean plants green absorbs energy from the sun and converts it to nutrients the plant uses, through the process of photosynthesis. Without sun, beans will die. Beans grow best in full sun. Plants grown in the shade won't grow as much and may not bloom. If bean plants don't bloom, they won't produce beans. Beans should receive six to eight hours of sun a day.
Bush bean plants can grow to be three feet tall, while pole beans can climb 10 feet or more. The plants need room to stretch out stems and leaves, as well as room for the roots to expand underground. If you're planting beans in pots, The University of Colorado recommends you choose a pot that's at least 12 to 24 inches in diameter.
Wait to plant beans until temperatures are above 55 degrees at night, according to Colorado State University.
Beans, like all green plants, take carbon dioxide from the air and release oxygen. The carbon dioxide helps convert energy into nutrients the plant can use through photosynthesis.