"This is a good prairie strain, " says the Alberta native.

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Mr Creg said that they were not opposed to people having the foreign strain in their gardens, but not when they were near a native woodland.

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His mother, Zubeidat Tsarnaeva, told the AP that her son greatly enjoyed his time with her relatives, but never traveled to her native village in a mountainous region of Dagestan, which is a hotbed of an ultraconservative strain of Islam known as Wahabbism.

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