I was wondering if you could use the Dry Start Method on mid-background plants? Does it only work on foreground plants? Thanks!
You can, but there's not much point! Carpets are frequently dry started because they spread outwards faster. There's usually some melting if you don't inject CO2 upon flooding.
Larger plants in my experience will grow somewhat faster but not in the same way, and the benefit isn't worth it due to the melt that follows