My plants are flowering! What now?

my first time flowering plants.. how much longer should i give them veg fert? Should i start using some kind of bloom fert asap? My friend told me to use some bud hardener should i get some of that?

i would give them half strength flowering nutes at first and then follow as directed...havent used bud hardener but fox farm products have been workin great for me

Bud hardeners are unnecesary if your getting enough light, and you stop using high nitro ferts. ff products work well, just don't feed up to harvest. Thier feed schedule actually tells you to feed all the way to harvest, but you can't do that with cannabis, or it will smoke bad.