I grow trees in central Alberta, mostly for acreages. I have an opportunity to add L. occidentalis (western Larch) to my lineup. I already carry L. sibirica and L. laricina. (Tamarack) The seedlot I have was selected for 900-1600 meters in the Kootenai region. In terms of landscape form and use, how would you say they differ? Tamarack Native to my region (central Alberta) Tolerant of soggy acid soil. If sedges grow there, if moss is happy, you can grow tamarack. Relatively transparent crown. 60-80 feet Fall colour is BRIGHT yellow. Siberian larch Non-native (but common shelterbelt tree.) Grows anywhere grass will grow. Drought tolerant. Somewhat salt tolerant Faster growth than tamarack Much bushier than tamarack (less transparent) Somewhat larger at maturity 80-100 feet. Fall colour often with an orange cast. Western larch Closest native stand is in Kananaskis. May be borderline hardy in zone 3 Faster growing than Siberian Soil preferences? Salt tolerance? Fastest growing of these larch. Mature height can approach 200 feet. What have I missed? I'm not looking for features to tell them apart. I'm looking for features that would cause someone to choose one over the other for their acreage or woodlot.