It's easy to make real flowers glow under black light or even in the dark. Here is a collection of glowing flower recipes.
“Ultraviolet flower” experiment
Make Flowers Glow in the Dark With Highlighter Fluid and UV Light (with Pictures) - Instructables
Glow in the Dark Flower, DIY for Beginners
How to Make a Glowing Flower Headband : 5 Steps (with Pictures) - Instructables
Glow Rose Wallpapers - Top Free Glow Rose Backgrounds - WallpaperAccess
How To Make Glowing Flowers (for pennies apiece)
Free STL file Glowing Vase of Flowers 🏺・3D printing model to download・Cults
Make Glow in the Dark Powder From Oyster Shells (Calcium Sulfide Phosphorescence)
These Glowing Flowers Will Make Your Iridescent Dreams Come True - Sunset Magazine
Make Glow in the Dark Powder From Oyster Shells (Calcium Sulfide Phosphorescence)
Pictures of Science Projects
HD Wallpaper: Glow, Colorful, Flowers, Shining, Shine, Glowing
Prank Your Friends with Radioactive-Looking Mutant Plants That Glow Under Black Light « Mad Science :: WonderHowTo