草木国土悉皆成仏
Meanings
1
all things have the Buddha nature
A Buddhist phrase from the Nirvana Sutra expressing the doctrine that even insentient beings such as plants and the land itself possess Buddha-nature and can attain enlightenment.
See also: 大般涅槃経
"Sōmoku kokudo shikkai jōbutsu" is a concept originating from the Mahāparinirvāṇa Sūtra.