care and health maint for fruit trees

[keakar]

I have a Satsuma tree going on 3 years in the ground and a manderine tree going on 2 years in the ground and about 4 ft tall spaced 10-12 ft apart and both made it thru the freeze ok. the Satsuma looks like nothing happened to it but the manderine tree dropped all its leaves but all the small branches are still green. I want to give them some TLC and speed up how fast they grow and get stronger.

what is the best way to care for them and ensure they get big ands healthy as quick as possible to make larger sweeter fruit?

I just don't know if im supposed to just leave them alone or try to give them tree food or fertilizer and such.

every few weeks I spray them with soapy water to keep the bugs away and I have removed the fruit every year so far because I was told it helps the trees get a better root system established if its not having to develop the fruit.

any advice is greatly appreciated, thank you