Ecology
Pachypodium brevicaule Baker grows in open, deciduous Western forest of Madagascar in full sun on sandstone, rarely on granite, in crevices between outcrops of quartzite. With a pH. Level varying from 3.5 to 4.5, it is strictly adapted to growing in acid substrates. (That strictness to acidity seemingly has implications to its cultivation.) It is found in the evergreen Sclerophyllous (Uapaca) woodland or savanna zones dominated by scattered woody plants. It grows at altitudes of 1250–1900 m (sometimes 2000 m).
Associated plant species, site indicators, include Pachypodium densiflorum, P. eburneum (Apocynaceae), Aloe compressa, A. capitata, (Asphodelaceae), Euphorbia quartzicola (Euphorbiaceae), (Orchidaceae), (Graminaea), (Bryophyta), and Lichenes. It occurs in a region that receives an annual rainfall of 1354 mm with a number of 5 dry months. Average monthly temperatures varies from 9 °C to 17 °C. The yearly average temperature is higher; however, at 13 °C to 18.4 °C.
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