There are areas with harvest-able trees. I had to TP 3-4 times until I got into a such area. In there I found 15-20 trees, but not quite bunched together. I'd say ~ 100 m or so between each. Only 3 times I've found 2 trees in the same range.
After walking over 4000m several areas on calypso... I have to say its quite dumb how scarce the trees are? I dunno... All that walking and i only found 1 tree... That was right outside one of the tp's i went to... Thats all i found..