Subtropical: Heavy fruit sets on Avocado this year

I wish we have a subtropical caregory under fruit growing so we can easily find anything that’s subtropical. So am attaching the subtopic on the title for easy search.

A couple of years ago, I grafted all the cold hardiest avocados that I can find and so it has 7 cultivars with 5 type B and 2 type A flowers. Earlier this season, they bloomed almost together and there were plenty of bees and syrphid flies visiting the tree.

So now it has heavy fruit sets that I am tempted to thin out the fruits of our avocado tree! From the floor of the deck to the top of canopy, avocados of different sizes and shapes from 7 different cold hardy cultivars on one tree are becoming heavier and heavier, made the tree droop and spread. I worry that some limbs might break.

This is a young tree about 3-4 years old and this is what happens when you have both type A & B flowers bloom at the same time. The heatwaves are just starting so am hesitant to thin it out as many of them would fall off. Will try to brace the tree after another heat wave.

It was hard for me to get avocados going in my yard. We have freezes every year. Many avocado trees have died before I achieved this. Two major things why they died:

  1. Rootstocks: all the rootstocks available from nurseries and big box stores don’t like our water. Too much boron, too much salt, high pH. We also have alkaline soil, so they all die within a couple of years if they survived the cold.
  2. Cold Hardiness: only a couple cultivars available from the same commercial stores are cold hardy but they’ll die if we got freezes colder than normal during the winter, such as wayward Arctic blasts.

So I researched and experimented with my own rootstocks, growing them from seeds of established trees of Northern California and then collected all the known cold hardiest Avocados of North America. And the result is this tree.

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a gold mine you have there @JoeReal. Avocado is a must-have if living in ca/fl, or if one has a greenhouse.

am green(as in avocado-green) with envy!

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It was hard for me to get it going. Many avocado trees have died before I achieved this. Two things why they died:

  1. Rootstocks: all the rootstocks available from nurseries and big box stores don’t like our well water. Too much boron, too much salt. We have alkaline soil, so they all die within a couple of years.
  2. Cold Hardiness: only a couple cultivars available from the same commercial stores are cold hardy but they’ll die if got freezes colder than normal.

So I researched and experimented with my own rootstocks and then collected all the known cold hardiest Avocados of North America. And the result is this tree.

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it sure pays to be persistent, especially with a high-value crop such as avocado

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Very impressive! Long term I would sell or give away your ideas if I were in your shoes because I’ve seen ideals lost due to an experiment that is never finished. A great pumpkin cultivar was lost I grew as a kid because I did not share it. The Etter apples are 1 of many examples of apples The Ettersburg Apple Legacies

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Looks terrific! What varieties did you choose?

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I am particularly interested in your approach to solve the problem of hard water. every nurseryman says you can grow avocado only if your water is low salt.

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Very cold hardy: Train Station Duke, Aravaipa, Fantastic, Brazos Belle, Bill’s Duke. Less cold hardy: Mexicola, Bacon
Least cold hardy: West Sacramento Hass.

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I’m also in 9b zone. I picked Stewart which I think would fall into your less cold hardy category. We haven’t gotten fruit yet but we’re hopeful!

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certain varieties from caribbean isles are used as rootstock for saline soil. Some hispanic stores sell avocados from florida/puerto rico. Those large, smooth-skinned green ones that have relatively pale and somewhat watery flesh(as opposed to the deeper yellow and cheesy texture of hass, etc). You could experiment by germinating the pits since chances are high of salinity tolerance

mexicola proved tolerant of a brief 17F in vegas which i found incredible. Funny that it was less tolerant of our summers than our winter cold.

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Less cold hardy is relative. The Mexicola while considered cold hardy, is still less cold hardy compared to Duke or Aravaipa.

The West Sacramento Hass is cold hardier than a regular Hass and it is my least cold hardy avocado on my tree.

I got the West Sacramento Hass from a friend who planted a Hass avocado in West Sacramento. The tree died down after an Arctic blast when we got 12F. He cut down the dead tree and then the stump sprouted a tree. It grew quickly and survived subsequent cold of 22F-24F and bore Hass fruits every year. It must have undergone epigenetic changes and the cold hardiness genes were expressed. It suffers minor leaf damage each winter.

The Aravaipa is the cold hardiest one that I’ve got. It keeps on growing even during the winter. It tries to take over the whole tree.

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amazing that aravaipa is hardy to cold just as it is to heat, as per video below.

have seen so much info on aravaipa, but for some reason haven’t seen anyone documenting production of fruits to maturity. Was curious if your aravaipa produced fruits and if it has decent production

https://www.youtube.com/watch?v=SC7VtIDRaNg

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My Aravaipa is loaded! Will experiment in using its seed as rootstocks. The owner stated that it tasted like Hass. Julie Frink said that their Aravaipa on UCR repository tastes just so-so. Hopefully I’ll be able to evaluate it at different stages this year.

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nice, keep us posted!

Story about the Aravaipa:
Here’s what I found out about the Aravaipa Avocado.

There’s a special story about it in the Fruit Gardener which I recommend you’d subscribe if you’re into fruit growing. It isn’t publicly available as it is copyrighted but accessible via paid subscription.

There were many avocado trees planted in Arizona and elsewhere near the Mexico Border when parts of the US were still under Mexico, sometime in the 1700’s and earlier. So it must be a long time of selection pressure for the various trial avocado plantings, by people freely coming in and out of Mexico and from Central and South America long before the US was formed.

In 1906, a rancher’s family purchased the deed to his land in 1906 in the Aravaipa Canyon, now a Conservation Preserve in Arizona, and there was already a good size avocado tree growing in it. The avocado tree must have first sprouted or planted in the mid to late 1800’s. The ranch is located at the bottom of a Valley, on a small mesa, just about 10 to 15 feet above the stream bed, and about 180 feet from the Aravaipa River. This means that during winter, very cold air from the mountains, being denser, would drain into this valley creating very cold freezing conditions, but the cold air would continue to drain down further into the river, away from the avocado tree, away from the ranch. According to the rancher, there are a couple of times or more that the entire mesa was flooded with 6-8 ft of water up to the trunk of the tree. Over the more than 100 years since their family acquired the land, the ranch had experienced many wintry snow storms, with regular winters of mid-20’s and plummeting as low as 10 deg F. During the summer, the temperature regularly get several days of 120 deg F and sometimes weeks of temperatures above the century mark.

The tree must be at least 125 years old and survived it all to be the great and unique specimen that it is to this very day. What sets apart this tree from other cold hardy specimen is that it is both very cold hardy and heat tolerant. The tree is also salt tolerant, able to thrive in saline sodic soils of Arizona, and tolerant of root rot from the flooding and prolonged wet soils during winter. The tree just laughs off freezing events and continues to be very productive.

The tree is now regarded by Arizona residents as a Native Arizona avocado, and is related to Hass, a Guatemalan race, and avocado aficionados know very well that Guatamelan varieties typically have rough tough skins and are the most cold sensitive. So indeed this variety is truly unique in that it is very cold hardy and heat tolerant at the same time. Hass will simply burn in very hot summer temperatures or die out or severely damaged after a few frosty nights during winter.

The cultivar is just starting to become popular. In my quest for having a fruit bearing avocado tree in North California, I seek out and added this to my collection. Thanks to my friend Harvey Correia who first told me about the story of the Aravaipa and let me take a cutting of it from his tree.

One of the drawbacks to its adoption is that some say it only tasted mediocre. Most people don’t want anything that isn’t at least as good tasting as Hass. Julie Frink, a revered avocado guru, wasn’t impressed with its flavor and at best considered it mediocre. But for our area, being mediocre is preferable to having no avocados at all. The current ranch owners of the original Aravaipa tree told that the taste is really delectable when harvested and properly ripened, and they had more sampling of the fruits than anyone else. As for me, one sample isn’t enough especially if you’re tasting many other avocados. A sampling through time of various harvest dates and ripening period is the best gauge for evaluating the quality of the fruits. Also the age of the tree has tremendous effect on the fruit quality, just like old vines making better wines than newer vines. I learned that as a winemaker long time ago, that you’ll have to bring wine across its journey through time, and one bottle isn’t enough. Flavor quality changes through time. Sometimes a slight modification in the “curing” or storage of avocados can dramatically change their flavor profile, and we don’t have a clue on how to handle Aravaipa Avocado, such as optimum harvest and storage time.

I hope to get a lot of fruits this year. So I hope to evaluate it properly for my personal recommendations. Regardless of taste, it is a must have variety, at least for me as I believe that it would surely be a good source of excellent rootstock just like the Duke, that are able to tolerate salt, heat, root rot, and very cold hardy.

Unlike the Duke avocado, the Aravaipa can be be ordered online and is often available. It costs more than the typical avocado tree from big box stores as the propagators don’t have the economies of scale. But also be aware that there are two types of Aravaipa being sold, one is also sold as Arizona Avocado, and is the original Aravaipa, and the other one is sold as Don Juan which many said is not the original Aravaipa, but dual labeled as such. The Don Juan is said to produce better tasting fruits than Arizona, and so must be another cultivar and I have no idea about its cold, salt, heat and rot tolerance.

Here’s a video link showing that the legendary tree exists. The family who owns the ranch and the original tree has invited one of the promoters, propagators and sellers of the Aravaipa avocado. The exact location of the ranch and the tree can’t be disclosed to respect the owner’s privacy.

https://www.youtube.com/watch?v=SC7VtIDRaNg

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Here’s the story about the Duke Avocado
Part 1:

Part 2:

As I have already mentioned, the best rootstock for our area is from the Duke Avocado Tree. The seedlings can tolerate well water high in boron and salts. I am suspecting the same for the Aravaipa so am excited to test them.

Fantastic/Pryor Avocado is green, paper thin skin, most cold hardy of all the Mexican avocados. The fruit
has a creamy texture with fantastic flavors. Eat skin and all. It is a vigorous growing beautiful tree. I am suspecting that the Fantastic avocado has similar genetics to Duke.

Brazos Belle or WIlma is also a cold hardy Mexican avocado. The fruit is large and has a very good flavor. The skin is black in color.

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Based on my observations, the Aravaipa is a type B flowering pattern, that is, it behaves as a Boy in the morning, shedding its pollens. The Duke is also showing a Type B flowering pattern, contrary to other observations. It should pollinate well with Mexicola, having a type A flowering pattern. Brazos Belle showed Type A flowering pattern. Both Type A & B flowering patterns are only important when the tree is young. When the tree is huge, you don’t care much as it will have both types of flowers on the different parts of its big canopy.

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Hows the flavor on some of these cold hardy varieties? Heard some taste like grass others are better than store bought whats your opinion?

The Duke tastes good. It’s smoother than Hass and has higher oil content. I don’t know about Aravaipa yet. Bacon and Mexicola are excellent, with Mexicola better than Bacon. Still waiting to be evaluated for the first time are Aravaipa, Brazos Belle, Fantastic and the Train Station Duke.

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After 3 more heatwaves, the avocados grew bigger instead of falling off, so I went ahead and braced the branches for support.









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