To add to hudson's reasons, high temps can cause airy sparse growth as well as low ones can cause small buds.
What are your grow conditions (troubleshooting form)?
Also, don't give up yet- 35 days in is still not in the major bulking-up window of some strains. Week 5 and 6 should make you celebrate more.
stinkyattic Reviewed by stinkyattic on . will you want to help? =).....please I know because it is way to soon for me to be posting in the "Plant Problems" forum AGAIN. argggghhh! Well this one i dont think i caused at least... My problem(at this moment) is this, i have a bunch of White Widow on their 35th day of flower and they are about 3-4 ft tall and very skinny. The buds look like every other plant i have seen at about two weeks in bloom. The diameter of what is supposed to be the colas are about, literally, maybe just a centimeter wide. Something is not Rating: 5