Bonsai Trees version: bonsaitrees-1.1.2-b144
Forge version: forge-1.12.2-14.23.5.2838-universal
I am not using Optifine: Not using Optifine
Link to Crashlog: n/a
Screenshot (if possible): n/a

Description of the problem including expected versus actual behavior:
Currently, Biomes O Plenty's Hellbark trees are set to grow on grass/dirt. However, being native to the Nether, I think it would be thematically appropriate to have them grow on Netherrack.

I've accomplished this clientside using CraftTweaker and the following:

//Bonsai Trees Hellbark grows on Netherrack only
mods.bonsaitrees.SoilCompatibility.addCompatibleTagToTree("biomesoplenty:hellbark", "netherrack");
mods.bonsaitrees.SoilCompatibility.removeCompatibleTagFromTree("biomesoplenty:hellbark", "dirt");
mods.bonsaitrees.SoilCompatibility.removeCompatibleTagFromTree("biomesoplenty:hellbark", "grass");

But I think it would be a worthwhile change to make to the mod itself.