Last December I reported how I had discovered fruits on one of my two largest outdoor citrus trees. Originally thought to have been seedling citranges, the fruits convinced me that these were actually citrumelos. Surprisingly, I had never seen the flowers.
Since April I have been carefully inspecting these 16-year-old trees for flowers. The fruiting tree has produced four flowers - again very low down and completely hidden by foliage.
The second tree has produced its first three flowers ever. These are just now starting to open - after a very cool spring and early summer. It shows how difficult it is to expect ripe fruit in this climate where first frosts can be expected in September.
Anyway, I'm really pleased these trees are now clearly past their non-flowering juvenile phase. Here are some photos.

Tree in garden:


Flowering area of tree - a rose flower on the right:


Flowers - first one opening:


Flower detail (with harmless pollen beetle):


Mike/Citrange

Very exciting Mike!
What are the coldest temperatures your trees have seen in their 16 years?

Lowest temperature was two years ago at -12C or +10F.
Last winter was almost as bad at -10C or 14F.
But it is the possibilty of frosts at any time September to May, and the short summer period when night temperatures are above 10C/50F that are equally bad problems.
Mike/Citrange

Great job on that Citrumelo. You have waited a very long time for the first fruit (16 years). How did it taste? Did it ripen in your climate?

For details of the fruits see earlier posts at
link
In summary, they looked pretty but tasted revolting!