In order to get this achievement you'll need to plant three different fruit trees at the same time in the Ranch. The different fruit locations are as follows...
Dry Reef:
Pogofruit
Cuberry
Moss Blanket:
Mint Mango
Ancient Ruins:
Phase Lemon
Glass Desert:
Prickle Pear
There's no real tips to be had other than the locations of all of the fruit types. Each garden costs 250, so this will only require 750 newbucks to accomplish. Another achievement in the bag!
Here's my video for every achievement if you'd prefer. Skip to 9:52 for Fruit Cocktail.
Happy Hunting!