I get asked a lot: why are garden centers allowed to sell invasive plants?
You read that some shrub or vine is an ecological wrecking ball, then you walk into a garden center and there it is for sale, with a cheerful little plant tag. How is that legal?
Most of the time, it just is. A recent study found that 61% of the plants identified as invasive in the US are still sold through the plant trade. That includes plants on state regulated lists, and even 20% of the federal noxious weeds that are illegal to sell anywhere in the country.
So why is it still legal? There's no blanket federal ban on invasives. Federal law only covers plants crossing state lines, so anything grown and sold inside a state is that state's call, which leaves a checkerboard: banned on one side of a state line, stocked on the other. State lists tend to be outdated, aimed at farm weeds instead of the ornamentals that wreck forests, and are barely enforced.
Underneath all of it is a profitable industry, and states don't like banning a profitable product. Even when a state does crack down, it cushions the growers. Indiana's invasive-plant rule gave nurseries a full extra year to keep selling their existing stock of banned plants, on purpose, to soften the economic hit. The plant's a known menace, but the inventory is worth money, so the register keeps ringing.
Which unfortunately means it falls to us. Three things actually move the needle:
1. Tell your state and local officials you want these plants banned, because those lists are political and what constituents say matters.
2. Ask your garden center to stop stocking them, because retailers drop plants when enough customers push.
3. Stop buying non-native ornamentals in the first place. Plant natives instead. A plant nobody buys is a plant they stop growing.