When to fertilize and prune tropical fruit trees?

Q: Can tropical fruit trees (Soursop, Mango, Star fruit, etc) be
given plant food any time of year? Also can they be trimmed this time of
year/summer?
A: True tropical plants (including fruit trees) need plant food
most of the year in real Tropics, where temperatures have very little
fluctuations, and active growth season is close to 12 months a year. In subtropical
areas when temperatures in winter drop below 65F, plant metabolism slows down,
so it is recommended to fertilize only during the warmest period (March
through November). So yes, Summer is the perfect time for fertilizing your trees;
their metabolism is at the highest point and they can use more food!
Trim your fruit trees right after harvesting. Obviously, you don't want
to prune branches before or during flowering or fruiting. The specific time
of the year for pruning depends on the plant - every tree has its own
flowering/fruiting season. However, avoid pruning right before winter: young shoots
promoted by pruning are tender and can be cold damaged.
Recommended fertilizers for fruit trees:
Fruit Festival Plant Food - Super Crop Booster
Mango-Food - Smart Release Fruit Tree Booster
SUNSHINE-Honey - for sweeter fruit
SUNSHINE SuperFood - microelement supplement