Have you ever noticed how many plants, flowers especially, have an animal in their common name? Back when most of civilization engaged in agriculture and animal husbandry, it was natural to name new things and experiences after more familiar aspects of life. It made for easier recall and association. Plants were no exception.
Of course, common plant names include many references besides animals; but the animalic ones are arguably the most fun, and most of us can name at least a few: Catnip. Foxgloves. Hen-and-Chicks.Tiger Lily.