I usually let off the Nitrogen (grow mix) just a little and bring the ratios back to even (as well as going only 1/4 to 1/2 strength) for the first two weeks of flower and then gradually increasing the 'Bloom' mix as the weeks tic by.. seems to work nicely.. remember, about 2 weeks before you are going to actually cut them down, flush them by giving them only water (no nutes)..
another thing to remember is that certain genes can be triggered sooner by environmental conditions/factors .. so dont wait until the plant is needing to flower but has no bloom components available for flowering.. you can introduce these earlier before the plant even needs them and since they are available the plant will switch/adapt and activate genes so as to use what is available in the environment.. anytime the plant looks really heathy, begin to push it along a track that you define, kind of force feeding it if you will.. so dont be reactive, be proactive and drive your plants to maturity and you will have better results.. remember, its a weed and can handle most of what is thrown at it but yield will be decreased if you just sit around waiting for it to show signs that it needs something else..
good luck

i've never heard of leaving in veg mix, this ia a first, first time for everything. I go straight bloom nutes with a P/K booster to make buds come faster, tells the plants in budding time

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White Widow/Sour Disel Grow Journal
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well i had to go away for a week so i made up the bloom mix at half strength and when i got back it was like a different plant.
Its really taken off and going strong.
5 weeks left to go till they should be ready hopefully maybe 6.
Going to try canna neuts next time

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Here to learn. To improve my education in all things

Oh and i replaced all that nasty noisy foil with some mylar. Much better effect all told i think

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Here to learn. To improve my education in all things