Dioon spinulosum giant dioon or gum palm is a cycad endemic to limestone cliffs and rocky hillsides in the tropical rainforests of Veracruz and Oaxaca Mexico. It is one of the tallest cycads in the world growing to 12m in height. The tree is found at low elevations to 300 m above sea level.Dioon spinulosum prefers well-drained soil with regular water. It will grow in soils containing few nutrients in soils rich in limestone and on slopes.
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