Q.Lemon Tree in 10 gallon planter in sunlight
I water twice a week with 2 gallons of water each time, and it seems to drain ok. I had 9 lemons blooming from 1/2 to 2 inches, and they all seemed to dry out at the attachment point and fell off. What am I not doing correctly?

Certified GKH Gardening Expert
It sounds like they did not pollinate correctly. The tree will reject the fruit while it is immature if the flowers do not get pollinated. Next time it is in flower, try taking a small paintbrush and swirl it around inside each flower, one after another. This will distribute the pollen and will pollinate the flowers.