1. Having recently played vv1, I found that you can use any of the plants to teach healing.
2. If you train some of the scientist early in the game to gather food, when you get to the last 60 food on the farm, put them all on it. You get a greater yeald.
3. Once the gc has polinated the plant near the lagoon, I use it to improve the health of the villagers. I also put them on something else for a while, till they recover their health bar.
4. Use children for healing, it gives them a start.
5. To make the game last longer, get all upgrades except the last science. That way you can gain more tech points, if your trying to make it on the leadership board. Once all has been acheived, they don't seem to want to reserch any more.