It's just getting old. Starting to yellow between the veins. It will eventually turn completely yellow and fall off.

How strange but good to know. My Anna did not react to lots of rain during an El Nin~o Year that way so maybe it is a problem with Ruby only. And you did say it had rained a lot recently by KY. Question: did Heidi say that it also could be because of too much nitrogen??? Do you know what is the logic there??? Meaning how that could trigger this type growth? Odd.

It should get more leaves in a few weeks. There are lots of trees in Denver metro that got frosted. Part of the problem is that it was a very mild winter and trees leafed out earlier than normal. Hopefully there's not another late freeze that gets the new leaves. There's been a couple springs that the big locust tree in front of my house didn't get it's second set until June.

What would be some other options for a backyard in a place like Montreal? I was looking at the Autumn Blaze red maple hybrid, Ideally i'd want something fast growing that's medium size full grown. Here in Quebec the hackberry is rated as a small-med tree that's fast growing, i guess it doesn't grow as big in this climate? But elsewhere online websites say it can become quite large. We have a state run electric company here and they have guidelines for most commonly planted tree species, so they're not planted too close to power lines. They say the hackberry grows to 50' high and 26' wide at maturity, which is a really nice size.. not sure what else would fall in this range and grow rapidly and have a nice round shape https://arbres.hydroquebec.com/page-tree-shrub/4552