High folks! A simple question, . Having put my timer to 12/12 today,the plants are well veged and covered with flower sites. When do I initiate adding a PK boost? Do I wait until I have flowers that are going to need help to grow fat buds or do I start earlier like as soon as the 12/12 is initiated or maybe when the flowers are starting to form. ??. Any advice welcome as always. It's why I use this site. Invaluable.