Nightshade is at least two weed strains. In the US, Nightshade is a heavy indica cannabis strain from Connected Cannabis Co. Connected does not disclose the lineage, but describes it as earthy, sweet, and gassy.  
 
 
 
1G - $9
2G - $18
3.5G - $35
7G - $50
14G - $90
28G - $160