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, Mexico
Vines & 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.
Batz Gallery 
What a great idea, Elizabeth! I like your focus here. The shadows can be mysterious and create a wonderful mood. I feel like I’m in the tropics. 😀😀
I see half of the plants were from here (Vancouver, that pretends to be tropical although it’s definitely NOT at the moment) and Mexico, which definitely does have a tropical climate.
Beautiful pictures Elizabeth, and I think your approach to this topic is very clever!
Not so much clever; I just love taking photos of plants and photos of shadows and here they combined into one.
Very clever and interesting approach this week Elizabeth – hadn’t really thought of that. Nicely done.
I only thought of this approach when I was doing a post on a variety of plant shadows, and noticed that my favourites were ones where the plant were shadowing themselves…
Excellent take on the challenge. Well done!
Thank you Sofia!
You’re welcome 🙂
Love that coleus shadow. Good eye!
The coleos was in one of the tiny gardens that the Vancouver city gardeners plant as little surprises all around town. I am now on the search for that type of coleus for my little garden – but the gardeners often use plants that I can’t find anywhere else…
We love coleus, and have a potted one on our patio every summer.