Soil Chemistry
Rapanarivo et al. sampled only half of the sites in Madagascar for pH level reading. The results show no significant difference in the soil type pH Level recorded in literature.
Pachypodium have a pH range from strictly acid soils with a pH Level of 3.5 to 5 to neutral to Alkaline soils at a pH level of 7 to 8. Species growing on gneiss, granite, and quartzite adapt to acidic soils. Species preferring a pH level of 3.5 to 5 are Pachypodium brevicaule, P. cactipes, P. densiflorum, P. eburneum, and P. rosulatum. The species growing on calcareous, limestone, for instance, adapt to a basic substrate. Species growing in acid to almost basic soil that have a pH level between 4.5 to 7 are P. lamerei and P. rutenbergainum. P. meridionale grows in neutral soils. And, some species tolerate both acidic and basic soil conditions. P. sofiense can be found in either soil condition. (For species that grow in only one type of soil pH condition maintaining that "simulacrum" of acidity or alkalinity is crucial to success in cultivation.)
Within the "arid islands" or micro-environments, the difference between vegetative type, acidity and immediate acidity of the surrounding biotopes of Pachypodium seem to be a significant factor in defining habitat type.
Read more about this topic: Pachypodium Habitats
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