One thing is for certain, Wave petunias can grow big and flower big! Vining varieties of Waves can often grow to lengths of three to four feet with ease. And more varieties have been developed since, in fact, Wave petunias can now be found in 3 distinct varieties – spreading, trailing, or mounding. Best of all, with just the few key care tips you can keep your Wave petunias blooming strong from early spring – right up until the first hard frost!