Genus: C. varieties Zones: All Zones Cost: From $8 Expert says: Caladium brings color to a shady garden in the heat of summer. And some newer varieties can even take a little more sun. —John Dromgoole, nursery owner, Austin –

Deep shade. Large evergreen or deciduous trees with low branches, such as Norway spruce, American hemlock, and eucalyptus, cast deep shade. The soil under these trees is often filled with mature tree roots. Only a few plants, such as moss, will grow well under these challenging conditions.