Crimsonwood Trees.

or you can cycle and while you cycle you can attempt to buy woods from people training at LA. I did that for a lot of my wood for my arcanon.

you don't even need to buy, just ask the people to hold onto it for you. Half the time they were just letting it disappear so they'll usually hold onto it until you come around again. I got a lot of free wood this way. Of course, when i was doing this Lower Ascent wasn't a popular spot yet so there weren't many people training up there. the fact that so many people train there now will make wood collecting even harder.

They should make a pure-spawn tree map off the courtyard in the keep. that would make it a lot better...