Finding an infestation of aphids on one of your favorite plants is not something you want to see in the garden.
One of the tricks I learned to combat aphids is to keep the leaves clean, even if it is just a routine spray of water. Once you experience aphids, you don't want to go there again.
Frugal Family Home has an excellent post on aphids that is very informative on all aspects of these pests. Click here to go to the article.