Critical Purple Rooftop Garden

I remember when I had my first grow two years ago, and I read in a book (I think it was the Handbook by Ed Rosenthal) that cannabis "grows like weed". Ha! It always seems difficult to start the seeds and I'm nervous the first couple of weeks because the seeds are so darn expensive that I'd hate to lose a plant, but by week 3 the plants take off and it just becomes a challenge to water them enough and feed them the right concentration at the correct frequency. I've reached that point, after bringing them inside for two days last week due to extreme temperatures (95 degrees outside). The seedlings are now about two inches tall and have the first set of five-lobed leaves...exciting when you can tell it's cannabis just by looking!