On the legacy bulb wiki pages Kathleen Sayce reviews bulbs that outlast their gardeners, with some hints as to why. Suggestions came from PBS list members, review of world weed lists, USDA PLANTS National Database, Flora of North America, and some university databases. For more information consult Legacy Bulbs Index and Introduction.
Information about other species is found on the pages linked below:
Anemone through Chionodoxa - Colchicum through Erythronium - Freesia through Hyacinthus - Ipheion through Iris - Ixia through Lycoris - Merendera through Nerine - Ornithogalum through Sternbergia - Trillium through Zephyranthes
Allium species: Edible onions and ornamental relatives occupy a deep and wide niche between food, ornamentals and obnoxious escapee thug plants. The genus is large, with 600-750 species; the true number of species varies widely among sources. Alliums occur naturally in temperate climates of the Northern Hemisphere, with a few exceptions. While the following includes notes on known states and provinces where plants have established (recorded in herbaria and/or mentioned by members), in most cases, more species are probably far more widely established than is realized. A few are pernicious garden thugs, including three-corner leek and wild garlic.
Generally in the food group:
Allium neapolitanum, white garlic, has established in California, Louisiana, Florida and Georgia. It is native to southern Europe, North Africa and the Middle East, and is classified as an invasive species in some US states. It has large heads of pure white flowers, and is often grown as an ornamental.
Allium oleraceum, field garlic, has established in Ontario, Canada, south to Virginia and Kentucky. It is native to temperate Eurasia, and produces seeds, bulblets in the seed head, and offset bulbs. It is found in dry grassy areas, such as sunny slopes.
Allium sativum, cultivated garlic, has established in most states and provinces of North America. Its place of origin is not known, due to a long history of cultivation and selection; it may have first appeared in Asia.
Allium schoenoprasum, chives, grows in most of the United States north of the southern belt, and is the only allium native to both Eurasia and North America. Chives have been cultivated in Europe for more than 5,000 years.
Allium triquetrum, threecorner leek, has established in Oregon and California, New Zealand, and Australia. It is a Mediterranean species, and spreads rapidly in disturbed areas. It is considered invasive in mild climates where it sets seed and spreads with ease.
Allium vineale, wild garlic, has established in most provinces and states of North America, ranging from Alaska to Florida to Quebec. Native to Eurasia, it has been introduced to Australia and North America, where it rapidly became an invasive species. It often produces bulbils instead of flowers in its flower head, which aids its spread.
Generally in the ornamental group:
Allium paradoxum, few-flowered leek, may have flowers replaced by bulbils; the bulbiferous form is considered a serious pest in the British Isles, where it invades woodlands and riverbanks. Originally from Iran, gardeners should look for the non-bulbiferous form.
Amaryllis belladonna, belladonna lily, is a vigorous bulb of warmer climates. It is native to the Southwestern Cape in Africa, with a large brown bulb and moderate growth rate. Bulbs may take a few years to establish, and then persist for many decades provided their needs for winter water and summer heat are met. When this species was discussed on the PBS list, on the topic of fall rather than late summer flowering, comments from many parts of North America confirmed that it is very widely grown despite being hardy only in WHZ 7-10 (11) and not blooming in areas where it is unhappy. In colder climates, popular planting locations include under south-facing house eaves, to ensure bulbs get their needed dose of summer warmth and are protected from the coldest winter temperatures. Amaryllis belladonna can persist for decades in favorable locations, though it produces ripe seeds only in suitable warm-fall climates. In one location on the Pacific Northwest Coast, it was first planted around 1900 at a military base, and was still flowering, though crowded, a century later, in 2010. There are many naturalized populations in coastal areas of California and it is naturalized in Louisiana as well.
Species listed on other legacy bulb pages can be found alphabetically by clicking on the links below or by going to the index and introduction page where they will be listed in a table.
Anemone through Chionodoxa - Colchicum through Erythronium - Freesia through Hyacinthus - Ipheion through Iris - Ixia through Lycoris - Merendera through Nerine - Ornithogalum through Sternbergia - Trillium through Zephyranthes - Legacy Bulbs Index and Introduction