Send a Valentine that blooms! This DIY Terrarium Valentine includes Plantable Hearts, which are embedded with the seeds of wildflower annuals and perennials. The handmade paper, made of natural, biodegradable fibers, will recycle into the soil as the seeds burst into flowers. Check out the video to learn how to make this card. Have fun customizing your paper terrarium for each recipient and adding your favorite plant pun to the message banner. Adjust your card and envelope quantity as needed to make your desired number of Valentines. The cards come in packs of 20 and the envelopes come in packs of 10. Plantable Heart Instructions: Soak in water overnight, plant under a thin layer of loose, well-drained soil indoors in a pot. Keep warm and moist until the seeds germinate (approximately 2 weeks).