How long should the flower stay on after it starts to grow?
Certified GKH Gardening Expert
If you are seeing blossom dropping, this is typical behavior for a squash plant. They will produce mostly male (non-fruiting) blossoms early in the season and will gradually start to produce more female blossoms as the season progresses. The male blossoms typically drop from the plant and seemingly disappear. Give it some time and you will see it start fruiting.