The french guru said it is Carrizo because of the typical greenish color. that differentiate it from Poncirus and Citrumelo.
He also said it is much more difficult to differentiate other Citranges.

So, I was wrong it is not Poncirus.
-Poncirus is light grey with green lines
-Carrizo is the same but the grey has a light greenish tint. (if I understood well)

Every day we can learn something.

Sylvain,

thank you very much for the suggestion!
Ok, I should admit that I'm confused... I could only google-out that Carrizo is semi vigorous... Is it hardy enough for zone 9a?
I think my plan will be to re-graft the plants I have to FD in couple years and migrate to the new rootstock in about 3 years.

Meanwhile, this is my concept of frost protection... This is how that Brown's select looks now:

The white stuff is a porous plastic (about 3 mm thick) normally used for packing. It seems to be holding warmth and moisture well.

The bud unions are covered by pipe thermal isolators (I had them in the garage with no use and decided to use instead of pots filled with soil as experts recommend):


Thank you very much!!

Carrizo Citrange is rated good for freezes and drought, but poor for clay or high pH soils, however, Carrizo generally produces a large tree with a high fruit yield and larger fruit. - Millet (768-)

Millet,

thank you very much! could you, please, recommend a good article/book on rootstock properties? I'm sure this would be of interest to many forumers.

Carrizo is actually a pretty good rootstock, with only a few cons. Carrizzo is rated poor for High pH soils, areas with higher salinity, clay soils, and it is susceptible to exocortis viroid, and just intermediate to blight. However, it is tolerant to nematodes and tristeza virus. - Millet (768-)

I had a satsuma killed back to the graft several years agol. It is now producing incredible crops.
It took some time in the spring before new growth began to show, so don't give up!

Darkman,

yeah, I know about that... This is why I was trying to dig the hole shallow but wide and make a hill on top of it. Also, our lot is inclined and, in the worst case scenario, I may make a drainage right from the planting hole as I did for blueberries.

In the winter of 2009-2010 trees in our area that were on Carrizo and sour orange were killed, including the root stock.

You would be better off to bank with dirt. That insulation on the trunk will do little to nothing. Your cover will work provided it is enclosed on the top to trap heat and reduce radiative losses to the clear sky. Put a light bulb under the cover as well. I really don't think you need any protection beyond banking with dirt for a satsuma in Beaumont.

My mature satsumas didn't drop a leaf last winter here in south Beaumont. Many times last winger a hard freeze was had by the weather station and I didn't get one.

It is a few degrees warmer here than where Bonnie lives approximately 20 miles north.

My cara cara navel on sour orange and panzarella orange on swingle didn't freeze. I banked the trunk with dirt. They did shed some leaves.