How to identify non-native summer flowers

… concern.
Soapwort (Saponaria officinalis)
Native to mainland Europe. Patch-forming … and riverbanks.
Goldenrod (Solidago canadensis)
Native to North America. Clump-forming … -leaved bellflower (Campanula persicifolia)
Native to mainland Europe. Short-lived …… concern.
Soapwort (Saponaria officinalis)
Native to mainland Europe. Patch-forming … and riverbanks.
Goldenrod (Solidago canadensis)
Native to North America. Clump-forming … -leaved bellflower (Campanula persicifolia)
Native to mainland Europe. Short-lived …