[austin-cheney]

> Non-native plants are often useless hosts for native insects.

The opposite can also be true such that some non-native plants can demonstrate overly desirable results compared to native plants. This is seen with many forms of squash/gourd/pumpkin in North America that results in wider and more aggressive distributions of herbivorous insects that favor those plant types over native plants.

[galangalalgol]

There is also a problem for manarch butterflies when people plant flowering plants they like, but in zones a bit colder than normal, and protect them from frost or replant. They bloom later than the butterflies expect, so they hang around too long on their migration and freeze.