As a sterile hybrid, Walker's Low catmint doesn't produce seeds so it won't spread into areas of your garden where it's not wanted, and it's not regarded as invasive. This herbaceous perennial has ...

like 'Walkers low' catmint or moss phlox. Otherwise, the weeds, along with their seeds, rhizomes, or other propagative material, will find wiggle room rather than being shaded out. There are a few ...