Herbs are hardy beasts. Like street kids who grow up in tough surroundings, these plants are survivors. Most have had to withstand harsh weather and little nourishment from the soil. This helps clear out the weaklings, making their genetic strains stronger. Their strength has also led them to develop an array of potent plant powers—phytochemicals: flavonoids and saponins, tannins and phytosterols. Read More About The Secret Powers Of Plants