I was thinking that it would make things easier if bloom destroyed improvements. At least then you would just need the caster and a worker and not a military unit.
On a related note I noticed something that could require a lot of management so I just didn't bother with it. You can't build a lumbermill on an ancient forest but you can build one on a standard forest and it will change to ancient eventually. That could make for a lot of micromanagement when you first get lumbermills. Chopping ancient forests then planting new forests, waiting for them to upgrade and then building lumbermills before the upgrade again. The three options would be to make lumbermills buildable in ancient forests, make forests not upgrade while then have lumbermills, or have lumbermills negate the extra food in ancient forests. Since I've heard people say fellowship of leaves is overpowered (or maybe it's just elves and fellowship, I can't remember) maybe it should be the second or third option.