List of 10 Plants You Should Never Buy

 Goutweed (Aegopodium podagraria)

Goutweed (Aegopodium podagraria)

 Lily-of-the-Valley (Convallaria majalis)  

Lily-of-the-Valley (Convallaria majalis)

 Chameleon Plant (Houttuynia cordata)

Chameleon Plant (Houttuynia cordata)

 Ribbon Grass (Phalaris arundinacea)

Ribbon Grass (Phalaris arundinacea)

Periwinkle (Vinca minor)

Periwinkle (Vinca minor)

Mint (Metha species)

Mint (Metha species)

 Sedum acre

Sedum acre

 Lyme Grass (Leymus arenarius)

Lyme Grass (Leymus arenarius)

 Running Bamboo

Running Bamboo

 Bell Flower (Campanula punctata)

Bell Flower (Campanula punctata)

 References:

1) Goutweed (Aegopodium podagraria) Photo: Funki Sock Munki
2) Lily-of-the-Valley (Convallaria majalis) Photo: yamaken
3) Chameleon Plant (Houttuynia cordata) Photo: Sunchild57 Photography.
4) Ribbon Grass (Phalaris arundinacea) Phot: Learn to Grow
5) Periwinkle (Vinca minor) Photo: Patrick Standish
6) Mint (Metha species) Photo: Kham Tran
7) Sedum acre Photo: Sólveig Zophoníasdóttir
8) Lyme Grass (Leymus arenarius)Photo: Thompson & Morgan
9) Running Bamboo Photo: Heather Bailey
10) Bell Flower (Campanula punctata) Photo: Qwen Wan