As of 1 year ago they were using Kuharski Citrange on everything except Kumquats and Limes, which are on C-22. This information was directly from Ricky Becnel. I think they were using Carrizo prior to this, and made the switch sometime in the last few years.

Is there a way to know which rootstock is which by looking at it? I have been buying their trees over the past 5 years and am curious.

Denise, I thought I had replied to this one, but maybe that was another thread or it got lost. Regardless from my research it seems that Kuharski is a sub type or close relative to Carrizo, so it is unlikely that you could easily distinguish the difference. In fact in most literature I have found it is commonly referred to as Kuharski Carrizo