 There are no endemic plant species but the relative isolation of the island has allowed a number of hardy species such as bird's-foot trefoil (Lotus corniculatus) and biting stonecrop (Sedum acre) to thrive. There are also a number of relatively rare plants, such as rock sea-lavender (Limonium binervosum), and wild leek (Allium ampeloprasum). The leek grows to 6 ft (1.8 m) and Flat Holm is one of only five places in the UK where it is found. Related to the onion, the leek has a bulb that grows for several years producing only leaves, then blooms with large purple flowers that smell of garlic. After flowering the bulb dies and produces up to 150 bulblets.
