I'm currently doing my first grow and I have 4 White Widow plants that are 5 weeks old (since germination). I'd like to harvest by end of december, which means there are 9 weeks left and according to the seed bank where I got my seeds from flowering takes 8 weeks. The thing is, they're only 30-35 cm tall at the moment and I'm wondering if it's okay to start flowering now, even though they have a lot of room to grow upwards (at least 60 cm more) and according to some articles I read plants like mine (indica dominant hybrids) grow only 1.5-2 times in height during flowering, which would leave me with ~60 cm plants. is this okay? what should I do? also, one of the plants has some yellow spots in its tips and they leaves curled up a bit (the curling has reduced though), but the other ones looked fine. could this be a potassium deficit? the thing is, I only have a nutrient mix, so I can't add one individual component very easily. sorry for the shitty pic, cell phone camera is all I have.