have you ever gerw this strain inside before? i dont know much about it. i grew afgan/ta inside wich grew very slow and tended to stretch. but when i moved them outdoors they took off really great. while my g-13 and pink grapefruit seemed to thive a little better indoors as aposed to out. other than maybe your lighting check your soil,a ph inbalance can lock the nutrients up wich can also slowgroth. if its a soiless mix check the water ph.