Leftwood said:Whatever you try, consider NOT removing the viola. When cooler weather returns at the end of summer, they will revive and bloom again, and all through the fall.
purpleinopp said:If you haven't yet found any scented Petunias, keep looking. Their scent is amazing.
You might enjoy 4'o'clocks (Mirabilis jalapa.)
If you have any more shady spots, Hostas with white blooms pack an amazingly lovely scent, and don't need to be replaced each year.
Heliotrope is incredibly sniff-worthy, and 'Cheddar pinks' Dianthus.