Purple deadnettle, bull thistle, purple loosestrife ... is a stunning, biennial wildflower that regrettably moonlights as an invasive weed in the U.S. That's because its seeds remain viable ...

thistle-like flowers. It spreads through extensive root systems. A perennial with heart-shaped leaves and deep purple flowers ...

Soil Conservation Technician When I moved into this new house, I was thrilled to see a large planted flower bed in the backyard. All spring I imagined what beautiful flowers would soar up and ...