If you are also fed up of growing trees on mount everest than this patch is for you!
Apply patch, compile and start the game.
Then exit the game by closing it.
Two new variables "trees_around_snow_line_range" and "no_trees_on_this_level" are written in openttd.cfg.
Both have value 0.
"trees_around_snow_line_range" handles tree growth around snow level.
If you for example set it to value 6 the program will put mixed forest from 6 tiles below snow line until snow line.
From snow line to six tiles above it will put arctic trees thinning out towards the snow.
"no_trees_on_this_level" gives you the possibility to skip a level for tree growth.
If for example you don't want trees on level 1 and 4 you have to fill in value "20" or 0x14 or "60" or 0x41.
You can do this for the first 16 levels. The max value is 0xFFFFFFFF.
If this value is set to 0 the patch stops working and everything works like the original game.
The next two foto's below are with settings "no_trees_on_this_level = 0x134" and "trees_around_snow_line_range = 6"
And..... stolen trees!
This patch will do for me.
If you have exotic variations please feel free to post them.