|A ten foot high bank of blackberries|
near Sidney BC.
We Sapiens are primates too and have been recruited to spread plants throughout the new and old worlds. First the Polynesians and then Caucasians brought the flora of South Asia and the Caribbean to the pacific islands where it would flourish. Without us, bananas and bougainvillea and coconuts would never have reached this near ideal environment to grow and reproduce. If you spend time on Tahiti, you'll see that almost every significant plant and beautiful flower is introduced as the old timers got dislodged. Self important people decry the invasive species and predict the end of a stable world ecology. Plants don't care. They got what they needed, access to prime habitat. Our reward, some pretty colours, smells and fruity bites. That's like a doggy treat from the plant kingdom.
Here on Vancouver Island, the broom and gorse and blackberry thickets almost define the landscape at the margins. That's hardly a hundred and fifty years of plant history, a successful colonization. Some groups actually spend time trying to extirpate these colonists, feeling moral ripping out immigrants to re-establish Eden. It's like a zoning bylaw to keep Hispanics and Asians out of a nice Caucasian neighbourhood. Ulex and Rubus are not pleased.