The truth is, if you cant grow weed in MG, then your probably a shitty grower, or it's your first (or second time using it and you don't fucking learn) using it. No dont plant seeds, or seedlings with baby roots in pure MG.
I've been poor my whole life. I never was able to afford FF soil, or even fancy Nursery soil and amendments, but I could afford MG.
After many mistakes and pitiful harvest, I got a great learning experience from it. One thing I learned is my problems weren't from MG, it was me.
This you have to concider when using MG:
-Don't, Don't, Don't, Don't, Don't, Don't ------
Don't give your plants extra vegetative fertilizer for at least three weeks, or until your plant show signs of nut def.
-The shit is "hot." Lotta inert nutrients from the start so you cant start from seed in MG unless it's the MG seedling starter stuff.
-You MUST MUST MUST (should...) amend MG with perlite. You cant really put too much perlite in MG but generally I stick to a 2:1 ratio soil to perlite.
-MG is easy to over water
-MG
IS great for outdoors
-Only water with R/O water, or any water with less than 30 ppm.....but use R/O water
-Oh yeah, DON'T GIVE THEM FERTILIZER FOR AT LEAST THREE WEEKS!
-You need a pH meter anyways, but if your gonna use MG, you'll need one evn more.
It's stupid to say that MG is for newbs, because generally newbs will make more mistakes using MG if they don't do their due diligence.
MG fertilizer I have never used. The bottle you showed didn't give the N-P-K value of it, but I'm guessing it's high. Veg state fertilizers usually have somewhere closer to 5-1-3 ish, so if that MG fert is much more than that I'd dilute.
My only problem with using miracle grow fertilizers is that their formula is geared to make things easy for little old ladies to feed their little violets and rose bushed. Most directions say to feed once or twice every few months so it's not really geared for cannabis
per se. Be careful if you decide to go that route. Good luck stoner.