C. ÂPretoria and C. Bengal Tiger are the same cultivar. C. ÂTropicanna Gold is a different cultivar. I posted photos of Pretoria (aka Bengal Tiger) vs. Tropicanna Gold at the link below on this forum group: http://forums.gardenweb.com/forums/load/canna/msg0700472120184.html
I believe the information attached to this link explains the very basic differences.
canna2grow
buyorsell888Original Author
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buyorsell888Original Author