Q.Why do the Beans form on plant but stop growing?
The green beans form small beans but stay that size. They are not growing bigger even after a week or more. They eventually turn yellow and die.
Certified GKH Gardening Expert
This can be attributed to a number of things, such as poor pollination, irregular watering, or the use of nitrogen fertilizer. A lack of pollinators can cause beans plants too produce less or develop poorly. Plants also need additional watering once they begin blooming. Since these are nitrogen-fixing plants, they do not need fertilizer, with exception to a side dressing of compost, if desired. An abundance of nitrogen will cause little to no flowering and poor pod development - adding some bone meal (phosphorus) can help offset high nitrogen content and encourage flowering/pod growth.