Nepetalactone has been identified as the compound causing the catnip effect [16]. Interestingly, not one, but half a dozen other active components similar in structure to nepetalactone (Fig. 1) have been identified in silver vine [6, 17–19], one of which also was detected in valerian root [20] and two, recently, in Indian nettle [15]. To the knowledge of the authors, nothing is known about the active compound(s) present in Tatarian honeysuckle. Data on the percentage of cats responding to silver vine are scarce and of poor quality [21] and, to the knowledge of the authors, non-existent for Tatarian honeysuckle and valerian root.