Common on savanna lands in Guam.
Seeds adhere to fur and clothing.
Also spread by water. It seeds prolifically each year which ensures survival. The seeds, however, are light-sensitive and germination requires exposure to light. On the other hand, exposure to far-red radiation, which is predominant where sunlight is filtered through a canopy of leaves, hinders germination. This species and other Hyptis species are common on Guam, but not present on most other islands in Micronesia.