For some reason, this ginkgo drops almost all of her immature ovules each spring. My guess of why is inadequate pollination, because there is not a male ginkgo close by enough.

In the past someone suggested it may be because the tree was sprayed with sprout inhibitor to prevent seed growth, however I highly doubt this is the case because NYC doesn't do this with ginkgos, and there are other female ginkgos in the same park who drop thousands of ripe seeds in the fall.