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A bulb-like swelling that occurs at the base of epiphytic plants, such as orchids, where nutrients and water are stored. It's not a true bulb.

Plants that have thick, fleshy leaves, which enable them to store water and so survive very dry conditions. Almost all cacti are succulents.

; John Innes potting compost No.2 for potting on; and John Innes compost No.3 for final potting of stock plants.Composts like this, which are soil based, should be stored in dry conditions and used within a month of purchase.