Hi Betrisher how are you.Cassia Nodosa is an expensive ornamental tree here in Pakistan & for best results is grafted on the local Cassia Fistula.
I love single color schemes, mass planting of single color.Betrisher actually mass planting of single color annual gives the best impact in a large garden.Mixed color schemes are well suited to small gardens as the space is limited.Thanks for your kind words.I,l post more for your pleasure.