The cause may be obvious or obscure and there may or may not be a remedy.
Possible causes are numerous and varied.
Some problems may affect all vegetables, others only one crop, maybe only one variety, or sometimes only one or two plants. Culture - soil preparation and tillage, seeding techniques, plant spacing and arrangement, weed control, root pruning, foliage pruning. Harvesting - timing, techniques. If the plants are growing well, this frequently is due to adverse night temperatures, such as below 60 degrees F. and above 75 degrees F. Very seldom does heavy use of nitrogen fertilizers cause blossom-drop, nor does sprinkler irrigation. Blossom-end rot of tomatoes and peppers .