Why aren't the herbs out of my garden as tasty as the ones I buy at Whole Foods?

Truth be told, I am a really good cook.In keeping with my desire to keep it fresh, last year I decided to grow herbs in a planter on my patio. They grow great, but they are not as full of aroma and flavor as the the packaged “fresh” herbs I buy at Whole Foods.
I may be doing something wrong.
What do I need to do to make them more herbal.