Petunias make such a beautiful splash of color they grow easily and add color not only to the garden but cityscapes as well. Purple Petunias are such a deep and intense color. They contrast so well with their green leaves. Petunias are wonderful annuals. The garden varieties are all hybrids and if you like the large flowering kind, get Grandiflora. They are not fragrant but you get an intense punch of color. They do well in borders, as well as in containers.