The various growing enchants seem quite unbalanced in the wilds. I just surrounded 4 flux wells with the nothing and filled the space in between with foul termite swarms and a few tortured ghosts and some shooting buildings in case anything somehow found its way in. There is also a shroud of blackness just to make life more difficult. Given 90 rounds to grow, you can cover a huge area, and the flux requirements are trivial. I can't actually spend flux fast enough. Unless a really motivated sylvan player shows up with restore nature's balance, that stuff is staying.

On a related note, things really slow down when you fill up the screen with these enchants, so that it seemed like randomly when I clicked on things there would be a 15-20 second pause before anything happened. I'm guessing popping up the options (for example where to spread the swarm) was causing a lot of strain on my video card. This makes it hard for anyone else trying to move into the area.