Day 45 Update
The plants are getting a bit bushier, which I like to see. A few of them are putting out buds like crazy. Lots and lots of buds. I'm actually concerned about that; I'd rather have a few highly potent buds per plant than dozens of popcorn nugs. But we'll see. This is my first grow, after all, and if I'm being honest with myself, I have no idea what I'm looking at here.
Interesting observation: three of my four plants smell terrific. Deep, skunky, and dank. One of the plants -- incidentally, the big, fast-growing one -- has developed a strange smell to its buds. Sort of a wet, grassy, almost moldy smell. I checked the buds thoroughly, including under a 30x loupe, but could not find any signs of mold or mildew.
I did some homework and learned that this "off" smell is sometimes the result of over-nuting. I've used mostly organic fertilizers to date (Fish Emulsion), but perhaps there's an accumulation in one pot that would explain both the plant's rapid growth and its unusual smell.
Yesterday afternoon I decided to do a light flush of the smelly plant. As of this morning, the smell seems to have faded a bit. Now it's more of a mild, vegetal smell, like freshly cut grass. So that's an improvement, I guess.
Here are some pics. The sun is only just starting to come up here, so the lighting isn't great. The color of these pics reflects a weird lighting situation, and not the true color of the leaves.