Auto flower soil mix??

Hello AlternateRick, I would recommend using Canna Terra Professional with only rhizotonic and a root stimulator for the first 2-3 weeks of growing autoflowers. You might notice a small Nitrogen burn during the third week, but it will quickly go away because it will soon enter the flowering phase. Therefore, you won't need any vegetative nutrients because there are enough in the Terra Professional soil. You could also use the Canna Terra Seed mix together with vegetative nutrients if you want to 100% control the amount of nutrients provided to your plants. Good luck with your project, I wish you all the best! 👽