WillyD,
Wow, the needle through the stem is a new one for me. I am not sure if that is really a good idea, the wound is an invitation for pests and also stunts growth. I have been growing Medical M.J. for about a year and a half, but "thoroughly" studied the subject and growing of it for about 20 years in my spare time. I love to help out someone in need. First things first. The cannabis plant will trigger flower when the night's dark period extends with the end of summer, this timing depends upon strain and location. Moving it indoors at night and out during the day can trigger flower earlier, if you can completely control light conditions. It must be absolutely dark, but also have a supply of fresh air flow otherwise it will confuse the plant making it go from veg to bloom and back again, also further stunting its growth. The good news is that if you want it to grow bigger it should with a little more time, it is called bud stretch and can double the size of a plant from veg to bloom. You will need to change the fertilizer to a bloom formula as well. That would be a 0-10-10, like Alaska Morebloom or something similar. Depending on your soil, you will want to take it easy on the nutrients. I know the urge to blast that sucker to make it grow well, very well in fact, but I have found that less is more. More healthy, that is. 1/2 strength is a good first dose with any new nutrients added, plain water for a week at the very least two to three is recommended, and then normal from then on. Stop using nutrients long before you think it will be done, 10-14 days minimum and flush thoroughly 3-4 days before harvest and let the soil dry out before harvest. I currently use Super Soil and organic compost outdoors and have the absolute best growth with no nutrients. If you are planning on continuing to grow look it up "Subcool's Super Soil". The recipe is on this site. Also look up Subcool on Youtube. I know it takes forever, but watch every episode. He covers almost everything you need to know.
On the topic of this threads discussion, here are some pics of the frost I got last year at the beginning of October right before harvest. I thought they were dead, but as the sun came up I watched in amazement as they slowly picked themselves up with one quick shiver after another all through out the greenhouse.