I'm growing a northern lights autoflower in the same soil I just grew a blueberry headband plant in. After one months time of growing my plant is only 8 inches tall. I believe my soil is stripped of all its nutrients. The plant is an autoflower so I don't want to transplant it. What can I do to replenish the nutrients my plant needs to grow properly? I am currently using the foxfarm trio grow big, big bloom and tiger bloom and am following the soil feeding schedule with superthrive. I just added a dose of epsom salts, 2 tlbs per gallon of water. I need help, thanks.