Nepeta (Catnip) or catmint because of their famous effect on cats—nepeta pleasantly stimulates cats'  typically resulting in temporary euphoria. 
The genus is native to Europe, Asia, and Africa. It is now also common in North America. Most of the species are herbaceous perennial plants, but some are annuals. They have sturdy stems with opposite heart-shaped, green to grayish-green leaves. The flowers are white, blue, pink or lilac and occur in several clusters toward the tip of the stems. The flowers are tubular and spotted with tiny purple dots.