Certain flowers bloomed at specific times in the Marian calendar, and monks, friars and nuns used them to meditate on and celebrate key events in Mary’s life.
Aegopodium, a.k.a. Goutweed, grows vigorously in temperate zones. Nothing except an extremely hot dry summer ever slows it down.
In my Midwest garden, I have V.chaixii, which is a 3-foot tall perennial with a basal rosette of felted leaves and a tall stalk with tiny yellow flowers.
To grow mums as perennials here in the Midwest, it is best to buy small plants in the spring and pinch them back in the summer for more blooms in the fall.
Natives with long tap roots like the bright orange butterfly weed are completely unfazed by the heat, as are shrubs like crepe myrtle and caryopteris.