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One thing people might not know about Calgary specifically is that it is very dry, and not a natural location conducive to planet growth. Large sections of southern Alberta are classified as semi-arid, and there is a striking difference in say, the number of trees between Edmonton and Calgary even though both are technically 4a hardness zones.

4a certainly limits the types of plants you can garden with, but sometimes artificial limitations allow you to create beautiful things. Would love to see some 4a garden pictures along with the thread.