It seems that plants have been omitted in Shadow of War, so that isn't a viable way to heal Talion.

When I am low on health, what options do I have for healing Talion?

The game has been a little light on instruction, except for a tooltip mentioning something about being able to heal by draining rats.

1 Answer

From a nerdburglars question:

At the start of the game, you will be instructed to press circle or B to interrogate an enemy. If you do the same to a regular enemy that is not a worm, you will be able to draw the life force out of them and heal you. If you spot any rats you can do the same to them for a quick kill and some easy health. You can do this while in combat, but it is obviously difficult to do if other enemies are attacking you. The drain seems to go a bit slower when enemies are aware of your presence, so it pays to use stealth.

6