Some of the planters along this stretch have had some struggling plants. It's very strange. Some planters are positively lush and then others are pretty clearly dying out. A project for Parks Toronto next summer I guess.
I hope not. If the trees were planted last year, the warranty likely runs out next year. Best to get them replaced before the warranty runs out!
If the shrubs are healthy but the trees are dead, it's probably just the stock, but they would need to extract the tree and see if the planter got the spec'ed soil at deeper levels. Contractors have been known to cheat, as they did on Bloor originally, putting crap in the bottom of the planter (and I don't mean fertilizer, I mean junk fill, instead of good soil)
Some of the species choices they made were off, most are good........but anytime I see a roadside planter with common juniper I shudder. It shows that the L.A. does not understand that plant at all.
(by way of explanation, common juniper, the spreading, low-lying evergreen can do well in almost any soil, if you don't drown it. But it's happiest in gravely, rocky, low-nutrient outcroppings that most other plants can't take.......
which is to say, it prefers low competition. Put it in super rich soil and the 'weeds' will fill in around it and smother it). It works, if you're willing to weed the beds 2x per year and mulch. Otherwise, bad choice.