Never too soon to start building a list.
Abutilon ranadei
Abutilon menziesii
Vestia foetida
Cleonia lusitanica
Dahlia campanula
Coreopsis 'Prairie White'
Tomato 'Candy's Old Yellow'
Lilium philippinense
Gaillardia aestivalis
Zinnia elegans or marilandica, virtually any pure white
Coleus
Cuphea hyssopifolia
Pelargonium gibbosum
