HabitatSteep slopes and canyons in semi deciduous tropical rain forest, generally at elevations of 265 - 500 m (870 - 1600 ft), in soil that is generally decomposed granite and rich in humus. The climate is subtropical, and rain falls generally in summer.
DistributionHonduras, Olancho department, near Olanchito and Ocote in the catchment area of the Rio Aguan.
In cultivation, Dioon mejiae is a beautiful and decorative cycad, somewhat similar to D spinulsoum in outward appearance. Adult plants of D. mejiae can be separated from D. spinulosum by their relatively stiff, straight, flat leaves, and leaflets without marginal spines Seedlings of D. mejiae have basal leaflets reduced to spines. Seeds of D. mejiae have a rough, deeply fissured surface and a prominent extension at the chalaza.
Dioon mejiae is best suited to tropical and subtropical climates but also grows well under temperate conditions. Its ease in horticulture, adaptability to both sun and shade, and some cold tolerance make this cycad an exceptional landscape plant. Plants in cultivation produce more and larger leaves than their wild counterparts and are reasonably fast growing. Dioon mejiae will develop into a sizeable plant in a relatively short time, especially in more tropical climates.