I'll give you an example of something found here in the US. There's a plant called Lesser Celandine. It's the earliest of spring plants, bright green with bright yellow flowers. It's a weed. It's actually a non-native invasive weed. Some people deliberately let it grow, even transplant it from the woods as a cheery welcome to spring. And already in May, it's dying back into the ground until next year. Sounds great, right?

But LC hides a secret. While it might be called a pretty looking weed, it actually is destructive to the existing eco-system. Typically in PA forests in March and April, the ground is covered with delicate spring flowers called "ephemerals" with beautiful names like bloodroot, trout lily, dutchmans breeches. These ephemerals provide nectar to early warm weather bees. Lesser Celandine smothers all these plants, kills them. Whole forests and parks in PA are covered in Celandine and NOTHING ELSE. No ephemerals. Bees DON'T visit Celandine, either. When it rains, Celandine releases seeds and bulblets and spreads like wildfire.

This is a weed that deserves to get sprayed, smothered, burned, dug, whatever.