Q.Newly Bought Fiddle Leaf
I just bought a new fiddle leaf plant, when should I put fertilizer?

Certified GKH Gardening Expert
Generally, you don't fertilize them. They have a need for high quality compost and soil, so with the correct soil they have enough food to last until each repotting, which will be each year. Repotting will need to be done in a container that is about an inch or two larger on all sides. Any larger than that with each transplant will likely introduce rot, since it will not dry out as quickly.
Here is an article for more information:
https://www.gardeningknowhow.com/houseplants/ficus/growing-fiddle-leaf-fig-trees.htm