Plants often become unkempt and straggly by late summer. Popular grandiflora petunias include varieties in the Supercascade, Supermagic, Ultra, and Falcon Series. While the flowers on the multiflora petunias are smaller than the grandifloras, they produce many more flowers. There are both single and double flowered multiflora petunias. Multifloras are generally more compact and resistant to wet weather than the grandifloras.
Single multifloras are excellent in mass plantings in flower beds.
Double multifloras are most suitable for containers. Excellent multiflora petunias include varieties in the Celebrity, Primetime, and Carpet Series. Their compact size makes them an excellent choice for containers and edging beds and borders. Varieties in the Fantasy Series are widely grown milliflora petunias. A 1995 All-America Selection, 'Purple Wave' grows 4 to 6 inches tall, but can spread 2 to 4 feet.