None of the Treant TP moves are overly horrid if you are near the monsters level.

Sapling type monsters that are near a Treant will link with it.

This spell can be soloed as soon as you can learn it. No party is needed for the Jugner Forest camp.

Bring Eye Drops to deal with Drill Branch, and a low level weapon to feed TP to the Treant.

There are four Walking Tree spawn points in Jugner Forest. The Trees will spawn in the general areas indicated with red circles on the map above. You should have no problems soloing the trees. Sapling type monsters will link with a Treant if you are fighting one. If you are lower level, picking up a few adds can be a problem, so take care!

Higher level Treants are also options. The Lufase Meadows Camp at G-6 is nice because there are eight spawn points, with a five minute respawn time. This allows for non stop killing if needed. As they are higher, if you plan to solo the spell you will need to be at least in your mid 50's if not higher. The Leshy aggro, and can link with saplings in the area. A High end 70's helper can handle the Leshy here easily. You'll need to be on or past CoP mission 2-1 for access to these mobs.

There is a great Camp in Grauberg (S). In the area circled on the map above, there are 21 Knotty Treants wandering the area here, all EP to a level 75 player. They can be easily soloed at 75. Because there are so many, in such a small area, it makes for a good camp to learn in, as you'll never want for targets. Respawn is outside fast too! Remember they can aggro, so try to avoid linking more as you fight.

Be aware that there are EP goblins in the area also, and they can still aggro to a 75. So take some care as you hunt the Treants.

There are many very high level Treants in the Bhaflau Thickets, Wajaom Woodlands, and Caedarva Mire. They are all 70 to Low 80's in level, and will require a party or skilled help to kill. With so many easier options, they are not recommended.