Hi, I think my Henry has been growing for about 5 months now. S/he's on my windowsill, and I dont have any lights cause I think my Mom only just about tolerates it for "horticultural purposes"

. I was just wondering how much longer Ill be waiting for some sticky-icky, it's almost 3 ft tall, and gets regular trims. I suppose my question is.....In a cool/temperate european climate, is a 12/12 light cycle essential to encourage budding, or will it start on it's own (eventually)?