Stunted autoflower — week 5 and only 6 inches tall

Had this exact issue last grow. What fixed it for me was flushing with pH'd water and letting the soil dry out before feeding again at half strength.

Looks like a classic case. Check your pH first — 90% of these issues trace back to pH being off. Even small deviations can lock out nutrients.

Don't panic! This is recoverable. The plant is tougher than you think. Make the adjustment and give it a few days to respond.