Sunlight is one of the most influential resources in the healthy production of bean plant harvests. Its energy allows for the necessary photosynthetic processes within the plant to take place and provide food for the plant. Restrictions on light can be used to control the growth rates of the plant but may also result in irreparable damage to the plant.
Healthy bean plants will grow straight up from the ground to a height of 20 to 30 inches depending on the species. Vine varieties can grow much larger and even produce over 100 bean pods during any given season. By controlling the light and temperature of the plant, gardener's bean plants are able to flower all year 'round, producing multiple harvests during a single cycle.
Outdoor bean plants must be planted in late spring when the season is warm and full of light. From this point until August, seedlings can be placed throughout the garden for a continued harvest throughout the year. Unfortunately, because bean plants are highly sensitive to the cold, a late frost can seriously damage the plants and make it impossible for them to produce fruits that year.
Indoor plants don't have much of the same concerns since temperature, fungal and insect threats are often minimal. Gardeners must give these plants a constant temperature of around 70 degrees and enough light to keep light deprivation symptoms at bay. This will provide the plant with enough energy and resources to continue flowering multiple times that season.
Without proper amounts of light to grow and maintain their foliage, bean plants will not offer a full harvest. The limits on their photosynthetic processes will slow all of the plants reproductive abilities and force the plants to conserve their energy to maintain the growth they currently have. Symptoms of light deprivation include wilted leaves, stunted growth and a noticeable decline in the production of fruits.
Bean plants are relatively easy plants to grow but require full sun conditions and adequate quick-draining soil and fertilizer. Without proper nutrition and energy the plants remain stunted to conserve energy. Indoor plants with controlled light settings are easy to cure. The key is to find the right balance of light and darkness for your breed of plant and to keep an eye out for signs of deprivation.
Outdoor plants are host to a considerable amount of threats. Leaf blight, deer and insect invaders can all easily destroy a healthy harvest. Indoor plants in clean environments often do not have these problems, but gardener's should keep aware of any changes in behavior that could be a sign of fungal infection brought in from outdoors.