Emerald Harvest - Cali Pro Bloom A&BHow Cali Pro Bloom A&B Works Cali Pro Bloom A&B comes with a profile of macro nutrients that will bring the very best out of your plants during the flowering stages, featuring increased levels of phosphorus and potassium for heavier plants and increased essential oil production. These base nutrients use only high grade chelated minerals, which form complexes that are more readily absorbed by the roots, ensuring that they get used more effectively.