It’s Christmas again, and most of our green roof plants have finished flowering, but in the eternal search for the longest flowering season possible I will undertake the 2016 review of our longest flowering species.
Again the Helianthemum nummularium has been the star, holding out well into November.
A slight surprise was a small sprig of flowering Thymus serpyllum peeping out from one of our oldest test rigs (5 years old).
These species have been consistent performers year on year, and I would certainly recommend their inclusion in almost any green roof design. It may be a coincidence that they are also low growing varieties, and therefore excellent choices for roofs that require high biodiversity support and visual appeal without too much maintenance.