Sorry for my spelling on "Lisborn" which should be "Lisbon". That's what happens when I watch TV and do this forum at the same time!

Have you tried contacting the grower to find out? I've been eyeing those trees also, and would be thankful to know the answer.

It will say on your tag. The standard W&N tag hanging on the tree -- on the back side -- there should be a sticky label attached. Mine said 'Semi-Dwarf Citrus' and the type. If yours doesn't say Semi-Dwarf anywhere on it -- then it is NOT dwarf.

I made the same mistake last week when I picked up a nectarine. I assumed it was semi-dwarf (since that's pretty much the standard around here) it definitely was not. Costco in Fresno sells both. You can't them apart, they're all lumped together in a small space.

Willits & Newcomb actually has great customer service -- just not by phone. I searched their site (wncitrus.com) and they do not provide a phone #, but do have an email. They responded to my email within 24 hours and provided me great information about the type of tree and rootstock.

They color code their trees. You'll find two colored dots: one below the bud (several inches above the soil) and one above the bud (a few inches above the bottom color). The colors identify the rootstock and scion.

Here is her email to me in regards to a NAVEL ORANGE I purchased. It's likely the rootstock colorings are the same on yours, but you'll want to email them yourself to confirm since you're not sure if it's dwarf.

=======================================================
Our semi-dwarf is either Trifoliate, C-35 Citrange or Swingle. We color code our trees so check the color BELOW the bud union; if it is
Black = Trifoliate
Red = C-35
Green = Swingle

Enjoy your tree.
Sincerely,
(removed), President
Willits & Newcomb, Inc.

Good luck
Chris

Here is a link that might be useful: Willits & Newcomb website