That plant looks a bit starved for light. There's a fair bit of stretch going on, though I've never grown the WW myself so perhaps that is just the normal characteristic of that plant.

3 weeks is going to be pushing it. By the looks of it you likely need at least another 4 - 5 weeks plus a few days of total darkness. Be patient. The plant can gain 30% weight in the last few weeks. If needed, you can leave her by herself for a week. Just give her a thorough watering / flush before you go.
bigsby Reviewed by bigsby on . Trichome development Is there anything I can do to stimulate or promote the development of trichomes? My (supposedly) White Widow from cannabisseeds.com (:mad:) has been in 12/12 for 4 weeks now. The lighting I have is a total of 253W of cfl's, and I'm going to have to go with that until harvest. My deadline for harvest is 3 more weeks as I want to have a few days to dry before I go away for christmas, and obviously I would like to be able to offer my friends something worth puffing. Thanks in advance. Rating: 5