For plants to cast shadows on themselves it helps to have an interesting shape or edge, where the cast shadow repeats and emphasizes that shape or edging.
The scalloped edges of this red Coleus repeating themselves on the leaves below.
The huge leaf of a tropical-looking Elephant Ear plant.
Calathea lancifolia, the Rattlesnake Plant, a member of the Maranta or Prayer Plant family Marantaceae.
Agave abstract with dagger-shaped shadows and white stringy filaments.
Close-up of the spotted leaves of a burgundy calla lily in the photo app Stackables
Fan Palm shadows in the gardens of Las Brisas in Huatalco, MexicoVines & green light in Snapseed. Tropical Philodrendrum leaf shadows.
Cut-leaf Philodendron in the Puerto Vallarta Botanical Garden using the photo app Stackables.
More of the Lens-Artists Photo Challenge: Light and Shadow.