Ashoka also claims that he encouraged the development of herbal medicine, for human and nonhuman animals, in their territories:
Everywhere within Beloved-of-the-Gods, King Piyadasi's [Ashoka's] domain, and among the people beyond the borders, the Cholas, the Pandyas, the Satiyaputras, the Keralaputras, as far as Tamraparni and where the Greek king Antiochos rules, and among the kings who are neighbors of Antiochos, everywhere has Beloved-of-the-Gods, King Piyadasi, made provision for two types of medical treatment: medical treatment for humans and medical treatment for animals. Wherever medical herbs suitable for humans or animals are not available, I have had them imported and grown. Wherever medical roots or fruits are not available I have had them imported and grown. Along roads I have had wells dug and trees planted for the benefit of humans and animals.
— Ashoka the Great, Edicts of Ashoka, Rock Edict
The Greeks in India even seem to have played an active role in the propagation of Buddhism, as some of the emissaries of Ashoka, such as Dharmaraksita, are described in Pali sources as leading Greek (Yona) Buddhist monks, active in spreading Buddhism (the Mahavamsa, XII).