Not enough information here to tell what, specifically is wrong with it - something you need to determine before effective action can be taken.

Same as with medical problems. If you are in the US, maybe there is a local USDA Cooperative Extension Service office where you can get diagnostic assistance. Try searching the web for "[your state] extension".

Oops, not "USDA Cooperative Extension Service" but the Extension Service office connected with your state's land-grant university.

But since you're in Canada, would be to local agricultural authority.

I suspect it has a root problem which may have existed prior to planting, one that's limiting uptake of water and fertilizer elements. Drought-stress is one reason tress get "fall" color too early in the year..