When to start using nutes?

Ok... these are autos, yes? They don't like to have any nutes for the first couple of weeks. When you DO start them, you've got to start them slowly - especially the GrowBig as I find it a bit too potent for autos (they're all I grow and Fox Farm is all I use). I actually start feeding Big Bloom as well as Grow Big about week 2 or 3... 1.5tsp Big Bloom and .5tsp Grow Big. If they tolerate that, you can increase both the next week but seriously, don't ever go more than 1tsp Grow Big as it's got just too much nitrogen in it which can cause lockout problems down the road. When they start pre-flower (around week 4 or 5), you can increase your Big Bloom to about 4tsp and cut the Grow Big to 1/2-3/4... when they go into flower, cut the Grow Big out completely and add 1 tsp of Tiger Bloom (this has SOME nitrogen in it which the plant will need but not enough to cause a lockout). As you get further into flower, you can increase Big Bloom to 6, even 9tsp and Tiger Bloom to 2 tsp. Always always always make sure you are getting some runoff when you give plain water.... this will help clear out any nute build-up. And always, always, always check the pH of whatever you're giving... it should be in the range of 6.0-6.5. You're on a fun and exciting road and I wish you luck! They look FABULOUS so far!