Q.Re: Lemon Tree
Last year we had a bumper crop. This year all the blossoms fell and looks like we’ll have no lemons. Is this correct? Should I prune and/or fertilize the tree? Thank you.

Certified GKH Gardening Expert
It is likely a pollination issue. Without pollinators, the flowers just fall off and do not turn into fruit.
These articles will help you:
https://www.gardeningknowhow.com/garden-how-to/beneficial/insect-pollination-process.htm
https://www.gardeningknowhow.com/garden-how-to/beneficial/creating-a-pollinator-garden.htm