Tellima grandiflora pops up all over the garden. It's a prolific self-seeder and these are very useful plants to have because they obligingly fill any gaps they can find (free of charge!). In a formal garden this damns them to the same category as weeds but in a wild garden they can go native.
 T. grandiflora is a North American plant. It's sold as a garden plant over here and a previous resident probably planted a few which have become many.
 Self-seeders are useful indicator plants i.e. the fact that they flourish says something about their immediate surroundings. In this garden the self-seeders are mostly ones that do well in partial shade and tolerate dry soil. The proliferation comes from the fact that both plant and the seeds find conditions which suit their growth.
 Often the best place to start when making a garden is to look at the plants that are already thriving: it provides a clue to which other plants might (or might not) thrive there.