![Petunias are heat tolerant annuals that require ample moisture and fertility to thrive. Several flower forms and colors are available, including fully double types. The single multiflora varieties are generally best for landscape use.](https://secure.caes.uga.edu/news/multimedia/images/1400/PetuniaATedrowlr.jpg)
Soil for Flowers
Annual flowers can benefit greatly from soil amendments. These plants only live for one season, so gardeners have a very short window of time to get them established to produce flowers.