The climbing onion plant is not related to onions or other alliums, but is more closely aligned with lilies. It is not an edible plant and can be described as an interesting, but not as pretty, specimen of flora. Bowiea sea onion is another name for the plant, and the plant has no obvious leaves because the onion-like bulb is comprised of compressed leaf structures. The best medium for growing climbing sea onion is a gritty, well-draining soil mixture. If you wish to make your own mixture, combine half potting soil and half sand.

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Source: Gardening Know How