Tower poplars are not very popular. You are confusing them with Swedish Columnar Aspens, which are very popular.
Tower poplars have a leaf with a silver underside and detents along the edge.
The Northwest Poplar cultivar is very well behaved.
Calgary is one of the last places in NA where elms can be planted. Ash do just fine here, not really my favourite tree as they leaf out late and drop early. Willows do great here and are native.
Disease is overrated. Bronze leaf disease was supposed to eradicate aspens and poplars a few years ago, well they seem to still be around. Fireblight is back but it's nothing compared to the fireblight endemic of the 90s.
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