One of the most common reasons why peas fail to produce flowers is lack of sunlight. Peas need at least six hours of direct sunlight per day in order to bloom. If they are not getting enough light, they will produce leaves but no flowers. Another possible reason for flowerless peas is temperature. Peas prefer cooler temperatures and will not bloom if the weather is too hot. Also, if the plants are stressed from pests or poor nutrition, they may also fail to produce flowers. If you are having trouble getting your peas to bloom, check to make sure that they are getting enough sunlight and that the temperature is cool enough. You may also want to try improving their nutrition by adding compost or organic fertilizer to the soil.