Stunted Autoflower

Download the Photone app and check your PPFD make sure your in range for this stage of growth hope this helps

I will first encourage you to start a diary here... reconstruct as much of this grow as you can remember... doesn't have to be everything! It will help us help you if any other questions or concerns pop up! As for this one, I don't think she's small at all! She does look a bit dry so perhaps you should be giving her a bit more to drink - and water AROUND her - encourage her roots to expand to the sides. You might also consider starting your nutes about now... only 1/4 strength to begin since you're growing in soil that already has some nutes in it - but those nutes are going to start running out and she's going to need a bit more to eat... I know I always think mine are on the small size at about this time... and then they hit week 3, 4, 5 and start exploding... she'll do the same! Good luck!

Seems like you need more light and you could raise the humidity too. I have my mars hydro fce 300 way at 75% power at 18nimchea from the plant. Since the plant will have more light you can up the humidity to about 75%. Google ppfd chart. Refence for environmental conditions to maximize growth.

for day 18 she is small but healthy, more moist, light foliage feed, higher humidity and temps , like 26-28 cel and humidity 70+ most of autos go nuts on week 4-5, yours is still everything upfront !