Echo Valley 42153 Petal Pot Sticker, 3.5 by 3.5 by 15-Inch, Set of 3 Glows in the dark; glow duration may last up to 3 - 4 hours, gradually fading over that time Decorative metal and glass stake designed for use in a potted plant or container; Can be used as a support for young starter plants and saplings Luminescent crystals inside the 1.5" glass marble absorb light energy during the day Releases stored energy at dusk in the form of a subtle green glow Weather resistant electroplated antique copper finish will withstand the elements and provide years of use and enjoyment