I was told that a flowering lemon tree should not be waterd untill the flowers turn into small lemons. Please note that my tree is in a greenhouse and in a pot.
Watering a Flowering Lemon Tree
Certified GKH Gardening Expert
You need to keep the plant evenly watered at all times. When growing fruit, citrus trees need quite a bit of water. I would not cut back water for them when they are fruiting, especially when they are in containers. In the ground, they can access water from deeper in the soil, but in containers, you are their only water source and it is just best to keep them well supplied for best growth. These articles will help: https://www.gardeningknowhow.com/edible/fruits/citrus/tip-on-water-requirements-for-citrus-trees.htm