Ouch, funny about the Oro Negro not even in the top fifty. So far The Stewart is sounding the best for my needs. Does anyone know what the mature size of the tree would be? I need to make sure I properly space them and want to maximize every square inch of my yard. Also does the root-stock influence the eventual size of the tree?

Please let us know if you find a supplier for these hard to find varieties, I live in Conroe Texas and have several in huge nursery tree pots that I protect from hard freezes. So size matters. 
I would take scions but if there is someone selling and shipping trees I could go that way to.
Thanks

Thank you, I will try to find a source.

Hi, I have had good grafting success with seeds from the (slim cado's) sold at my local grocery stores, but with all the new research going on for disease/pest resistance along with vigor and such. I was wondering, what is the latest greatest type of avocado seed to use? I am in Texas so of course it has to be salt tolerant and I also wondered if the root stock seed used would have any affect on taste and if it would make a less vigorous strain like Wurtz for example more vigorous.
Thanks for any info you can offer.
P.S. I would also like a source for the seeds

Looks great, where could I get a tree are scions? I am in Texas and think this would make a great addition to my other Avocado trees.

Thought I would see if there were any new or newly discovered avocados for those of us in colder climates?
Some winter protection would be used while they are getting established.
P.S. I am in zone 8B and have several trees now.

Okay so I talked with the master gardener again and she insists these are two different types, so I will purchase one of each and see what happens. Here is how they have them listed.
Native Arizona “Aravaipa”—A Haas variety (Guatemalan) found in Arizona mountains; extremely cold hardy.
Don Juan—Produces good sized fruit with a speckled green skin. The flesh is of exceptional quality. After years of maturity, it may reach 23 feet tall. It is cold hardy to mid-10° F.
 

The County master gardeners are going to have some trees for sale on the 11th the Arizona and one they are calling Don Juan? I have not heard anything about that one either, I am going to call the Master Gardeners office later today and see if I can get some info on both.

Are there any types that are non- commercial and cold hardy. Just me and my wife to feed so I don't need huge yields, just good quality. Most commercially available cold hardy types have poor taste and texture, we are wanting something close to or better than a California hass but has to be able to handle our colder temps here in zone 8b. Of course it will be protected while small and planted next to a south facing wall, but will have to able to handle the cold when large. Then is there anywhere to get scions?
Thanks

I currently have a couple of Mexican unknowns from a friend in California, Bonny Doon, GreenGold, Stewart,Brogdon, Bacon, Gwen and some seedling Bonny Doons.

Most of my citrus is twenty years old now, I got ambitious when my wife and I took a road trip to Disney Florida in my (then) new dodge truck and bought back a lot of trees. I have a naval orange, Orlando Tangelo, Honey tangerine, Meyers Lemons, Ponderosa lemon, Hamlin Orange. My Avocados are four years old and younger, I have Stewart, Brogdon, Bacon, Wertz, and the rest are grafted by myself from scions begged, pleaded, and bought. I have Bonny Doon, Green-gold,and several Mexican unknown grafts from forum friends who swear they are good. I also received some Bonny Doon avocados from a different forum friend that were over ripe so didn't really taste good but I started all of those seeds just to see what will happen.
P.S. I also have Hibiscus to protect from the cold.
P.P.S twenty years ago they still allowed citrus to go across state lines.

I'm no expert, but I have neighbors begging every year for my citrus. Most of my trees came from Florida twenty years ago when I drove to Disney with a new pickup truck. I am just North of Houston Texas and cover my trees and run flood lights when it gets really cold here. My naval is great, no idea which kind it is but can't really compare it to a homegrown California since I've never had one.

I guess I'm lucky in some ways, my place is old enough that I fenced the entire property front and back. I have no trespassing signs and beware of dog signs every ten feet apart on my entire fence . there is no way anyone can come on my property and steal fruit with out knowing they are trespassing. The only down side is my dogs are chihuahuas and although they act ferocious no one takes them seriously