how exactly did you map you terrain with roses? I've been thinking of a way to map grassy areas of my landscape with grass.. but the dirt areas without grass.
Everything is placed randomly over the terrain using 2 minimesh systems, one for the grass, one for the flowers. The only placement I did was to make sure it didn't place them on/under the water. An that was just a simple check on the Y axis. You could use a map of course, where say red pixels are an area where to place grass, white is where not to place grass etc. Then just read it in an place according to the image. I think byte was doing some work in this area.
Edit: Yea, check this:
http://www.truevision3d.com/phpBB2/viewtopic.php?t=7263&postdays=0&postorder=asc&highlight=map&start=15