excellent answer Mary, and right on the money.
Due to the bee decline, many problems htis year with insufficent pollination.
at times, this too can be attributed to extremely hot/humid conditions, where pollen is actually melted before it can be transferred.
In the event that you have males, but have not got a female quite open, pick two or three males, and put them in a vase of water and sit them in the refrigerator until the female flower opens, this works very well.

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