Scarlet Star of Madagascar: Pachypodium baronii var. windsorii

A prestigious pachycaul prized for its sculptural bottle-shaped trunk and rare, vibrant crimson blooms.

1. Origin & History of Name: The genus name Pachypodium comes from the Greek pachys (thick) and podion (foot), describing the swollen base. The species honors Reverend Richard Baron, a missionary and botanist in Madagascar (1872–1907). The variety name windsorii refers to Windsor Castle, a prominent limestone massif in northern Madagascar where the plant was first identified.
2. Morphology: This variety is a pachycaul succulent, characterized by a globose, swollen caudex (trunk) that stores water. Its epidermis is silvery-grey and armed with paired spines. Unlike most members of the genus that produce yellow or white flowers, windsorii is distinguished by its hypocrateriform (salver-shaped) flowers in a brilliant shade of red, emerging from the leaf axils.
3. Habitat & Origin: This is a wild variety endemic to a very restricted area in Northern Madagascar, specifically near Diego Suarez. It grows on steep limestone cliffs and rocky outcrops. Due to its limited natural range, it is highly endangered; our plants are produced through sustainable nursery propagation to protect wild populations from poaching.
4. Cultivation Profile:
   • Substrate: Use a highly porous, mineral-based mix (volcanic rock, grit, and coarse sand with minimal coco-peat). Excellent drainage is vital during the Indian monsoon.
   • Light: Requires full sun to bright light. In most parts of India, it thrives in direct sunlight, but young plants should be acclimated to avoid bark scorch during peak May heat.
   • Water/Dormancy: Water regularly during the hot growing season (March–October). In winter, the plant undergoes obligate dormancy and drops its leaves; water must be strictly withheld to prevent caudex rot.
5. Scientific/Historical Anecdote: Pachypodium baronii var. windsorii is considered an evolutionary bridge within the genus. While most Pachypodium species are pollinated by moths or bees, the vivid red color and specific tube length of the windsorii flower suggest it may have evolved specifically to attract birds (ornithophily), a rarity among Malagasy succulents.