What fertilizer should I use on a fig bush and crepe myrtle tree?

Answer 1

with liquid fertilizer you will stand a better chance of not burning them up you can use a 5 gallon bucket with a pin hole in the bottom filled with water and the liquid fertilizer set next to the plant

Answer 2

It doesn't matter what fertilizer kind, it just matters the amount to use.
Fig bush: about 1/2 to 1 pounds annually, depending on the bush size.
Crepe myrtle tree: about 1 and 1/2 to 2 1/2 pounds annually, again depending on the tree size. Don't fertilize too late in the year one this one.