Trial species
- Campanula cochlearifolia ‘Takion Blue’
- Campanula glomerata ‘Acaulis’
- Coreopsis ‘Presto’
- Echinacea ‘Cheyenne Spirit’
- Gaura ‘Sparkle White’
- Prunella ‘Freelander Blue’
- Scabiosa ‘Ritz Blue’
- Silene ‘Starry Dreams’
- Verbena rigida ‘Venosa’
Source: Bedding and Pot Plant Centre