I found that the Nirvana White Widow had 2 distinct pheno's when I grew them from seed. One was more sativa dominant than the other. I kept the indica dominant for a mother and have been very happy with the resulting clones.
What I have noticed about growing WW:
Nute sensitive. I find that I have to use around 1/3 of the nutes with ww than I do with my other strains. They tend to develope nute lockout if overfed.
Stretch in 12/12: I put my babies in to flower when they are 12 in. to 14 inches. They will stretch about 3 times the height, or more, depending on how they where trimmed, or not trimmed. I usually end up with mature plants around 3.5 to 4 feet in height and very bushy.
Takes to LST, fimming and topping very easily.
Clones easily.
Yeild: Varies acording to grower, but as an example, I grew out 7 clones and had a yeild of around 2 lb. from those 7.
Grows well indoors as well as outdoors.
Smoke report: Uncured bud tends to be a bit harsh which improves with curing over a couple of months in jars. Leans toward couch lock as the indica seems to dominate the high, but not so bad as to impede activities. Good for use in Vaporizers, better smoked in a bong.
I keep growing it, even though I have other, more 'up to date' strains. It has become one of my mainstay strains.

Note: I grow in soil, indoors, under 400 watt lamps. Your results may not be the same as mine due to differences in growing enviroments.

Happy growing