Sprouting Growth Chest WoW are easy to open if you know where to go. You'll find these chests after completing some platforming in Maldraxxus. Here's how to get these chests in Shadowlands.
Sprouting Growth Chest WoW: How to Find and Open
Maldraxxus has areas that are overtaken by giant mushrooms. You'll be able to find Sprouting Growths and Grappling Growths around the area. The Sprouting Growth is a chest, but you can only get to them with some platforming.
You might encounter the chest high up on a mushroom, but you'll need to find a grappling point nearby. You'll be looking for more small mushrooms, labeled Grappling Growth. Latch on to it, and you'll get on top of the mushrooms. From here, it's as simple as following the path and getting to the chest.
There are nine Sprouting Growths to find in Maldraxxus. Since these are grappling points, you'll need the Grappling Hook spell to reach them. Switch to your Rogue alt to grab these ones.
The locations of the Sprouting Growths have actually changed since the beta, so you'll have to re-explore and look for the grappling points. They're not too far from the Chests, and you can follow the path backwards to the Grappling Growth.