The Tropical Fruit Forum

If it is a Suebelle it is a much smaller tree, like a peach tree.  Check for fuzzy leaf undersides.

Brokay Nursery in CA has been using a modified Frolich method since about 1975.  You might Google them and/or contact them.

Just finished last two Hellen avocados for this year, still hanging on tree.

Trees here are densly planted as original 15 ft spacing has diminished due to overplanting.  Cold temps we experienced 20 years ago (low once of 17º-killed many mature eucalyptus trees in area), used return-stack heaters in those early days, covers, etc.  Trees are fully grown now and canopy effect and global warming (recorded evidence for local winter temps) there has been no real damage in past few years.  During the fight against freezing played with many alternatives.  Found temperature, freeze duration, humidity (dry cold nights were the worst) and soil moisture relevant to damage.  Canopy effect keeps humidity high along with soil moisture.  Freeze duration is shortened with higher humidity.  We are in 300 ft of dune sand so never worried about overwatering.  Did burn lot of diesel fuel in heaters in those days.  Plant maturity today makes a difference.  Those were immature plants back then, we are now close to 50 years here on 1 1/2 acres.  Never had C. tetrameira burned except new leaves.  C. edulis have been lost to freeze.  Then again, tree location, humidity, etc. are factors to consider more than temperature.  I have a 10 degree difference from one part of property to another.  Colder areas get citrus, warmer areas hold avocados etc.  If it was easy it wouldn't be fun.

Nice to see your opinion on yellow sapote (Casimiroa tetrameria) # 7 is in agreement with an old CRFG taste test.  CRFG #6 is out there, but most prefer CRFG#7.  I've posted this before, doing it again: using C. tetrameria as a rootstock for C. edulis severely dwarfs the white sapote down to 4 ft. Using C. edulis as a R/S for C. tetrameria makes a much smaller tree, about 8 ft. Both have remained  compatible for over 20 years and produce normal sized fruit.  It would be interesting to see what an interstock of various lengths would do.

Have Triumph and Mammoth (NZ varieties) and they produce well.  Large fruit with good flavor.  Never been hit with frost (over 20 years) down in middle 20's maybe lower.  They groundlayer easily (low branch covered with soil, roots within a year, cut off is new plant).

My two NZ varieties of Feijoa are outstanding in flavor and size compared to Coolidge etc.  They are Mammoth and Triumph and very productive.  Have not had success with cuttings, but ground layering (on ground or in a pot still connected to mother plant) have rooted well.  Ripe now, I prefer to bite off top of fruit and squeeze out fruit insides. Not just a good fruit, frost hardy, and ornamental too.

So Mike, how is the fruit? Taste like "bubblegum"?

https://www.greenleafnurseries.co.nz/shop/fruit-trees/feijoa-s-figs/triumph/

I have a NZ Triumph if you want scionwood. 

Maybe someone knows differently, but it was my understanding that for full flavor and good production M. nigra needs to be in the ground.  My M nigra "Kaester" has an extensive root system (on fruitless mulberry rootstock, tho) and seems to really like water.  Here roots are constrained by drippers in pure sand.

An old time member of CRFG and a friend had a different technique (John Moore of Santa Maria).  He used Wilhold white glue to seal the scion after wrapping the union with tape, string, etc.  Served like our use of parafilm and allowed the buds to penetrate the seal.  I have used Wilhold glue (it is water soluable and can be thinned) after removing taped union to protect the new tissue under the tape.  Glue stretches with growth and breaks down.

Brad, sometime in the winter.  My Reed is feeling the effects of drought and plugged drippers, have not seen fruit for a couple of years.  Hellen hangs for most of the year and ripeness is determined by local raccoons.  If it's OK with them, I pick some.  I have a couple of Hellen (2 L's) and both produce well, small seed.  The variety was suggested by Julie Frink.  Not watery, just a very nice fruit.