I grew Purple D about 4 years ago. She's an easy strain to work with, reasonably potent, with great looks and a strong aroma. She IS NOT a heavy producer so dont beat yourself up if your G/Watt ratio is low.
She did well in both soil and hydro for me. Should take 8 -8.5 weeks to finish and will turn all kinds of purple if you drop your night time temps to aprox. 60 deg. during the flush period.
She is also a fast grower and a MAJOR stretch can be expected during the flowering phase. If done in hydro that flowering stretch is almost out of control so consider yourself warned.
I will say this about her, if properly flushed, the last hit tastes as good as the first.
Cheers to you, She was one of my personal favorites to grow and I am sure you will feel the same once you get to know her.