What is a weed? A plant whose virtues have not yet been discovered – (Emerson). Maybe not but they can have a tremendous impact on a customers first impression of a garden centre.
An external planteria provides a rich environment for the germination of weeds, whether weed grasses like Annual Meadow Grass, or weeds such a Pearlwort, Mares-Tail, Rose Bay Willow Herb Bitter Cress or Groundsel to name a few and the odd Lichen thrown in for good measure.
The important factor is that a customer is not expecting to see weeds in a garden centre, especially when qualified and able staff meticulously tends the displays of merchandise to attract sales.