Polar express is a lovely girl. Lovely night time smoke. Extremely easy to grow. A cat or fox dug up one of mine at 4 weeks old snapped the main stem at about 5 inches leaving nothing but the stem and 2 small stalks. It was laid out on the ground for 24hours. I couldn't see it die so planted it in the ground and forgot about it. Come harvest time I got 24 grams of lovely sparkly bud from it.
Very resiliant and mould resistant.