What fertilizer do I use for a potted lemon tree? What insecticide?
What Fertilizer Do I Use for a Potted Lemon Tree?
Certified GKH Gardening Expert
These articles will help you with fertilizing: https://www.gardeningknowhow.com/edible/fruits/citrus/fertilizing-citrus-trees-best-practices-for-citrus-fertilizing.htm
As for insecticide, we would suggest using neem oil. It is safe to use, is very effective against insect pests and also serves as an adequate fungicide. Here is more information: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm