I haven't grown White Rhino, although it's been on my list for a while. It has, however, never ceased to leave my mind whenever I think of the 5 best strains I've ever smoked. It was frosted beyond belief. Very earthy, skunk flavor. Kinda more hash-like & dark than it is sweet, but a great deep flavor nonetheless!
You read some strains that are 20% potency or more that have the description 'narcotic high'. I would have to say this is one of the only strains I've smoked that I'd personally give that description. And damn right it deserves it! =)
Have you already bought your seeds or are you looking to purchase soon?
I'm growing White Widow right now and they are from the same genetic line. I find they are easy to grow compared to others. Loves nitrogen during veg, as it will branch out with lots of tight nodes & future budsites if you keep em fed properly with good lighting. I really appreciate the compact budsites over some of my other strechier strains. White Widow from what I read grows best & yields more when topped. If you have the room for it, def bush it out by topping multiple times throughout veg.
And with any strain, be patient in letting them finish! While they say 8 weeks, I'm gonna let my WW go 10 if she lets me (and I'm 99% positive she will). You WILL see an incredible difference in both weight & potency.