hi, sorry I've been away for a while...

I mentioned in a few other threads that when I was working on my cross-breeding charts, I used a different ordering scheme than Borg did on his (so my discovering more facts about breeding and mutations came independant of his results.)

My charts sorted the flowers and foliage by tier order. That helped me discover many facts posted in this thread. (namely that crossing a Tier 1 & Tier 2 flower or foliage would result in a Tier 3!) I'll try to remember to upload a copy of my charts later. It may be useful for others.

I haven't done much research on the different game levels, and the notes I have as to what will survive are incomplete since my first priority in any game is to upgrade my soil!

However, I did determine that the soil requirement of a plant is which ever is the higher tier of the flower or foliage.

i.e. a Tier 1/Tier 3 would need soil necessary for a Tier 3 plant, while a Tier 2/Tier 1 would need soil for a Tier 2 plant.