How do I stop the incursion of weeds into my perennial flower beds?

Sandy
by Sandy

I have extensive perennial flower beds, and weeds, invasive and otherwise, from taking root, and spreading? What types of plant should I install in these beds to discourage weeds. How close do I need to plant these additions? Is there a ground cover that I can use? And if so, what is it and where would I get it. I live on Vancouver Island BC, which has a temperate rainforest type climate.

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