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My indoor plant is about 3 ft tall and needs bloomed immediately. I switched the lights over but not the ferts yet. PLEASE advise
Depending on how often you use your ferts I would stay on the same schedule and start going to boom ferts a week or two after you start 12/12 cycle. Two weeks maximum!
Example:
You gave plant veg ferts on last day before 12/12. Now you either give your newly 12/12 plants bloom ferts on your next scheduled feeding or the one after.
Also, If your plant is 3 feet tall I would start thinking about how you will support buds when they get heavy. In my early experiences I ended up having to make all types of strings and stakes to hold the buds up.
After a 3 foot plant really starts to bloom, given enough light it will have some heavy buds that will fall over. I have experienced this many times.
FYI - Your better off growing 3 foot tall plants and starting to bloom at one to 1.5 feet. Each will get much more light to lower levels of plant and, if god forbid one dies or just isn't healthy, you have more than one egg in your basket persay.