Is Miracle Grow safe?

Yes it is safe. It isn't a very good nutrient system for cannabis, but it's no more harmful than any other chemical fert.
 
I remember when I had to use it.Just run a good fresh water flush if ya want to kill the salty taste.I've done all the way up to week 4 of flower with MG and finished off with good nutes and supplement's before too.
 
good for small seedlings i hate to say it but its true. ive had faster growth with 3 week olds in that stuff than happy frog. but as time goes on when you up pot and repot it will need to be in happy frog or fox farm.
 
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