Both have doubled in size this summer but frost/temp concerns, again. No flowering in first year but maybe later, I hope!
This message was edited Nov 25, 2012 4:56 PM
SOLVED: ID both cacti in the same pot
smaller 'cactus' in that pot is Euphorbia mammillaris, or fimbriata (either synomous or very similar)... not a cactus.
The Plant on the left (which is the Cactus of the two), is Isolatocereus dumortieri
And here in DavesGarden very own PlantFiles: http://davesgarden.com/guides/pf/go/64117/