With no personal experience, I am going to say it is the long flower time.
Not only trying to finish before frost, but there's more time for something to go wrong.
Luckily NL is a tough strain and tends to pass some hardiness to its offspring.
stinkyattic Reviewed by stinkyattic on . How quickly will flowers grow? Attached is a picture taken roughly a week ago. This is a NL5xHaze plant in it's 2nd week of flowering. To date, the plant is covered in flowers, but they're all fairly small. My question is, how quickly will these girls fatten up? Rating: 5