New Pot Grower,
The stem is skinny and tall rather than short and sturdy because the plant isn’t getting enough light and it’s getting the wrong combination of spectrums. The sunlight is good for the plant and its intensity can be increased by making a reflector from cardboard or plastic to reflect incoming light back to the plant. Rather than using the incandescent plant light, use a 50 or 100-watt (not 50 or 100-watt equivalent) warm-white compact fluorescent lamp or a small watt metal halide lamp. I’m not suggesting a high pressure sodium lamp because the unusual color is inappropriate near a window. Keep the light on continuously until you are ready to force the plant to flower.
The reflector and either the fluorescent or metal halide lamp will provide ample light.
Readers with grow questions (or answers) should send them to Ed at: Ask Ed, PMB 147, 530 Divisadero St., San Francisco, California 94117, USA. You can also email Ed at AskEd@cannabisculture.com, and send queries via his websites at www.ask-ed.net. All featured questions will be rewarded with a copy of Ed’s new book, Best of Ask Ed: Your Marijuana Questions Answered. Sorry, Ed cannot send personal replies to your questions.