The question really is, are your plants still growing vertically? The reason folks say to feed veg nutes until Week 6 - 7 is because typically the plant continues to grow vertically until then - if it's growing vertically it's creating new foliage and building stems so vegetative nutrients are good to keep going at that point.
So if your plant is still growing taller, keep feeding veg nutes, then as it starts to slow down or stop, switch to bloom nutes (very little, i can't preach this enough.. I've burned a plant or two.. or more.. with tiger bloom).
Don't forget FoxFarms schedule also includes the 12/12 light switch and is tailored to photosensitive plants. They say to switch to bloom nutes at the first sign of flowering because it'll force the plant to start throwing bud sites and push it into the flowering stage.
If you do this with autoflowers you're sacrificing vertical growth as once that switch is flipped in the plant, it focuses it's energy on blooming as opposed to vegetative growth.
As far as flushing between the switch, I do, but I run Hempy so I "flush" once a week - when I ran soil I did not and do not advise it. If you're concerned, plain pH'd watering between the switch of nutrients would suffice - but remember, you're feeding the plant at a critical time in it's life so depriving it of nutrients isn't a good idea. Also, flushing does cause the plant stress - so why stress the plant when there's no need.
EDIT: Didn't see evol's reply before I posted mine, sorry for doubling up on the information.
I did find this to add though;
Thanks man, appreciate all the help :smokebuds:I should have been measuring them because I'm pretty sure they have stopped growing taller but I can't say forsure. Just to be safe ill give them veg nutes today instead of just going to the hot tiger bloom. I'll give tiger bloom nutes around day 45 how's that sound
Oh and the grow big nutes say 2-3 teaspoons so how much do u recommend I give for my first feeding?
Like half a teaspoon or a fourth or what :cough:
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