Tasmanian Alpine Yellow Gum (Eucalyptus subcrenulata) Update. 5.25.2021.

 I think I planted this Eucalyptus subcrenulata in late 2018.  It replaced an American Linden that died of unknown cause.  This was a small potted tree, about a foot tall.  Now I can't reach the top, about 9 feet tall.  E. subcrenulata is considered among the more cold hardy Eucalyptus, originating in Tasmania.  The young leaves have a eucalyptus fragrance when crushed, but the older leaves have a sort of a mysterious curry type fragrance.   Deer have not touched it.  The leaves are tough.   I don't water this tree at all.  I do have a deer fence to protect from buck antler scratching, which can destroy a young tree.

The bark of older trees is described as having streaks of yellow.  It looks like the young tree has colorful red bark.

Alpine Eucalyptus at 2 years. 10.30.2020

 This is the end of the second year for this Tasmanian Alpine Eucalyptus.  Also called Tasmanian Yellow Gum.   It's reportedly more cold hardy than the types known in California.  With la nina this year, we'll find out.

It's difficult to see in the photo, this tree is now about 7 foot tall.  That is without watering this year.  I don't think deer have touched it at all.  It has tough leaves with a somewhat odd fragrance, which may make them unappetizing.  When fully grown, it should have colorful bark

 

Another close up.  The new growth can be quite nice.

Fast Growing Eucalyptus

Not only did it survive the winter, it is growing by leaps and bounds without supplemental watering! This tree has some potential. Of course, next winter might be colder, resulting in a dead eucalyptus, but that's part of the intrigue.

These remain green, Midwinter

It's encouraging that there are still green plants in the yard. The opuntia and Rosemary have survived about 5 Winters so far, so must be OK in this climate.
The Eucalyptus cinerea may not be ideal for this climate, given its milder provenance in Australia and New Zealand. This is a 'global warming' tree - I'm trying it given that we've had some 'zone creep' and former rules may not apply any more. The hardiness zones have moved. Of course, when the hard freeze arrives in February, it might not look so good. It might be Eucalptus gunnii instead - I'm not sure about the labeling.

The Euphorbia remains green (or more correctly, red/green) as well. It's in a dry microclimate which receives almost no rain.