Knipofia, dwarf hybrids
Hemerocallis 'Kwanso'
Tradescantia X andersoniana, several colors
Dianthus, garden pinks, many cultivars
Origanums
Hostas
Solidago
Arctotis
Argyranthemum
Erysimum
Alyssum/Aurinia
Centranthus ruber
Geraniums
daffodils
Lilium
Papaver orientale
Cerastium tomentosum
Nepeta, several
Lamiums, several
Salvia, rosette types (sclarea, Aethiopis, transsylvanica, austriaca, etc.)
Euphorbia, a number of them
artichoke
Acanthus, several
Helleborus, many
dwarf conifers
dwarf shrubs
Dieramas
to start with