New Grower which nutriens are the best for my autoflowers?

Jack's classic, dynamic duo. It's cheap, easy to use and gives consistent results.
 
I use plant magic range, with the npk of 3-5-4 or w/e ratio it is along with calmag and old timers bloom. I found that the lower npk of the plant magic range is great for autos.
As the rule of thumb is less is more!
Try a variety and see what works well for you, but for ease and time, plant magic works for me :)
 
I swear by Schultz'. I might use the all purpose for the third and fourth week, but I'll usually use their bloom nutes for the life of the plant.
Never, ever burns, even at recommended strength, watering every day. Full of micronutes. Assuming you have "normal" water, never any deficiencies. I've used it for the past 15 years exclusively.

I used to drop a lot of money on fancy ferts, until I finally got (quite literally) schooled.
 
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