No matter what time of year, I am unable to grow botania flowers using bonemeal in a sacred springs biome, tested with and without serene seasons enabled in the same biome - issue goes away with serene seasons disabled.

Tested using:-

Botania R1.10-354
BiomesOPlenty-1.12.2-7.0.1.2384
Forge 1.12.2 14.23.4.2707
SereneSeasons-1.12.2-1.2.2-universal

wow that fix was released much quicker than i thought, thank you :)