As we all know most perennial flowers should be planted in the fall so that they will be ready to grow and produce blooms in the next season, but there are a number of perennials that require different treatment. These are known as C-4 plants as Dona Bergman explains in her article which I found on the Planters Place website.

She said with serious indignation,? ?You are a professional gardener and of all people should know that you do not plant perennials now.? You plant in the fall.?
I barely knew this person, so I just smiled in that Southern sort of way that says ‘mind your own business.’
Last week I planted an entire perennial garden not only in the heat but in mucky, totally saturated soil. Next month a design that I did for a new art museum goes in. End of August, I?m installing a design in New Orleans. Day after day, I dig, divide, replant, and ship perennials from my nursery.

Summer Perennials are a Thing

The myth of fall planting applies only to certain kinds of plants. Some plants need to be planted in the summer.

Ever heard of C-4 plants? They use a specialized sort of photosynthesis to operate efficiently in high temperature environments.? Sugarcane and most grasses are C-4 but there thousands more.? Not all of those below are C-4; honestly, most people don?t need to know about C-4, but simply to understand that some plants grow roots, shoots and fruits best in mild temperatures while some do so in scorching temperatures.
See more including the list of 10 perennials to plant in summer at Planters Place

Image source: Forest and Kim Starr