Anything that makes a humid, dark under-layer. In our case, it's the English ivy ground cover. After a few minutes searching, this seems like a good guide: ht

Anything that makes a humid, dark under-layer. In our case, it's the English ivy ground cover. After a few minutes searching, this seems like a good guide: https://www.gardenguides.com/12588077-ivy-and-plants-that-harbor-mosquitoes.html https://www.gardenguides.com/12588077-ivy-and-plants-that-ha... Ivy, violets, tree holes.