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Small well-watered ’plantlets’ of Agave vilmoriniana Berger collected from the flower stalk of a single parent plant were grown out-of-doors at Phoenix, Arizona in clear-plastic-wall open-top enclosures exposed to ambient air and air enriched with CO2 to 300 mu l. l(-1) above ambient. Analysis of 12 harvests of three plantings conducted over a period of 4 years revealed a temperature-dependent CO2-induced growth enhancement for this desert succulent. The linear function used to describe the relationship was indistinguishable from a similar relationship previously derived for 16 non-CAM plants. (C)1995 Academic Press Limited