Bio Dome Sponge 5 Cell Refills

Extend the life of your Bio Planting Block with these economical and reusable Bio Sponges. Perfect for starting new crops, they make it easy to grow healthy, vigorous seedlings season after season. These replacement sponges are designed to fit perfectly into Park’s Original 60-cell Bio Dome. For more information, explore Park’s Bio Dome Seed Starter System. Grow like a pro with Bio Sponges! Materials: Compressed natural sponge material, peat-free growing medium, biodegradable.