you should def pick up a (microscope) that way you can look at the resin glands real closely. Not a telescope, thats to look closer at stuff, however that is really far from your relative position, i.e. space.
30 bucks or less radio shack.
How big are your grow pots/containers?
You want to flush every 21-30 days to avoid problems that you are experiencing.
This becomes increasingly more important when you enter flower.
I imagine you have no PH-test to make sure your water is in the correct ph - range, required to grow in soil.
Go to your local pet store pick up an aquarium ph test kit. Then buy some distilled water which has 0 PPM,PH it to around 6.5-6.6 and flush the shit out of your plants, double the amount of water as the volume your soil holds. (2gal container flush 4-6 gal of water etc. so on and so forth.) after this wait untill soil is light and dry before watering again.
Grow those for a couple more weeks, otherwise the finish product will be weak and non-potent.
You'll thank me later i promise! Good luck.
P.S. your plants have not grown long, in the sense that, thats about how long you would have to grow a plant to get it mature and all when starting from seed.