Useful plants (other than aquatic) in relation to their environment; ecology, phenology, environmental

biology, external influences on biological processes in useful plants; indicator plants;

Forest ecology.

For: aquatic plant ecology, see M40

climatic influences, see P40

conservation of plants and vegetation, plant wildlife management, botanical gardens,

arboreta, see P01

ecology of organisms used in pest and disease control, see H10, H20, L72, L73

national parks,  see P01

plant hardiness, see H50

rhizosphere influence, see P34

weed ecology, see H60