Bio Dome Refill Sponges

The perfect medium for strong, well-aerated roots!

Seed-starting mixtures try to achieve an ideal blend of aeration, moisture retention, and nutrients, but too often seeds become waterlogged or blocked as they try to establish roots. Bio Sponges are the perfect medium, encouraging roots to grow downward instead of spiralling. And Bio Sponges are completely biodegradable within 2 years!