The Box

I believe this to be about week 3 of growth. This is an auto plant, my 1st auto ever. So im unsure how they are sposed to grow. Somone told me they grow for about 4 weeks then start to flower. But at this point i feel pretty worried. As, if this is week 3 of growth, my plant is minuscule. And wont gain much in a week. Ive only got 4 true