Nope, no ivy. Alas, I also had dreams of a beautiful gecko topiary.
http://www.practical-pet-care.com/article_view.php?ver=3
This should help, I've posted it a couple of times, it is for all lizards, so some MAY be ok for geckos, but better safe than sorry, IMHO. Good luck.
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0.1 Albino Leo Gecko
0.1 Crested Gecko
1.0 Dear Boyfriend
Departed: Harvey and Spock


