There are two sub-packs you can switch between in the addon's settings - one for regular trees and the other for taller ones.
How to install addons:
- Download the addon straight from your device
- Find and open the .mcpack or .mcworld files that you download earlier
- Click it to import it into Minecraft Pocket Edition
- Open the game
- Create a new world or edit an existing world
- Scroll down to the Add-ons section and select the ones you want to apply
- Make sure to enable all "Experimental gameplay" features in Settings
Reason: Added 6 Mangrove Tree Variants.