Retro forte

I have just flushed my plants with a little Epsom salts and put them into flower, I want to give retro forte to them, should I do it now then start them on canna bloom ? Help!!!

hmm i've never heard of retro forte but i use bud blood to start the flowering process because its high in P and its the level of P in a plant that can activate a quicker bloom so whatever is the hightest in P i'd start with that

Thanks, good help!