Know When to Hold 'Em, Know When to Fold 'Em.
Sometimes you just know when it's time for a planting to be removed. There are still blossoms, the plants are still green, but the usefulness is gone. Other flowers need to take the stage.
I debated leaving the purple Daturas until frost, maybe even pruning them to enhance the lacquered-look black stems. Most of the blossoms are done, leaving lots of knobby dark seed pods, some dry and opening. Eventually they had to go to make room for Salvia leucantha to make a stunning fall show. I left one small one that had young buds, in another bed.
Most of the Mexican Bush Sage in my garden has purple calyxes with purple flowers. Janie shared the purple calyx/white flowers cultivar. Shown together, you can see the difference. The calyxes are very velvety and fun to feel.
Salvia leucantha is hard in zones 8-10; treat it as an annual elsewhere. It doesn't begin to bloom until the days grow short, making a beautiful fall display when summer annuals are beginning to flag.
Found this little video while looking for the lyrics to Know when to Hold 'Em, too Cute.
You'll want to hold and fondle Mexican Bush sage blooms and they dry beautifully.