OK scrap the 1.5 liter bottles, I have been doing some reading on the official Lowryder grow guide

"For best results, place jiffy pellet or plant directly into 1-2 gal.pots. Alternatively, start in 4-inch peat pots, then place
rootbound females into a plant bed after sexing (at approx. 17-20 days)"

"Lowryder females usually grow no taller than 16-20 inches. 12-16 inches is typical. Light intensity, pot size, and proper pH all play an important role in determining the size of plants at maturity â?? the better the conditions, the bigger the yield. Plants produce one main cola, although when they receive adequate light, lower nodes branch out profusely."