Blackberries (Rubus fruiticosus) Although wild blackberries are common they tend to be small and seedy. Of the numerous cultivated varieties that have been developed, only a few will tolerate our Canadian winters. All blackberries adore intense sun, heat and humidity, so even though we offer the hardiest varieties, they desire a sunny site and will benefit from winter protection. Another thing to consider–the blackberry plant itself is actually a medicinal herb. The leaves and even the roots have proven to be very beneficial for treating a host of human ailments. Canes are bareroot