You will want to plant them individually. If you have 4-inch pots (a standard size for transplants), space them 18 to 24 inches apart (this helps with air circulation—a preventative measure to stave off powdery mildew). Individual plants typically grow 2 to 3 feet wide, at which point dividing them is a good idea to keep that air circulating!
Hi Joan,
You will want to plant them individually. If you have 4-inch pots (a standard size for transplants), space them 18 to 24 inches apart (this helps with air circulation—a preventative measure to stave off powdery mildew). Individual plants typically grow 2 to 3 feet wide, at which point dividing them is a good idea to keep that air circulating!