Precautions for Watering When Lemon Tree Is at Flowering Stage
Do the flowers fade or fall (or the fruit falls) if watering is done at this stage?
The folling article will have most of the information you requested: https://www.gardeningknowhow.com/edible/fruits/lemons/how-to-grow-a-lemon-tree.htm
For addional information, enter lemon care in the search window at the beginning of the article. This will show links to other articles on lemon care and problems they might have.