HoldFast™ goes to market.
Our seaweed tech is now inside Modern Sprout's Fertilizer Sheets — the first product built with HoldFast on shelves.
Tear. Drop in water. Feed your plants.
Modern Sprout's Fertilizer Sheets are a new take on plant nutrition: a thin, water-soluble sheet made with HoldFast seaweed-based film technology. Each sheet carries a measured dose of plant food and dissolves cleanly in water — no plastic packet to throw away.
These seaweed fertilizer sheets are the first commercial product built with HoldFast, and they're designed to leave nothing behind except the nutrients your plants can use.
Look for the HoldFast Certified mark. It means the product was built with our seaweed-based film technology and meets the HoldFast standard.
See the full HoldFast Promise →"We started building HoldFast in 2023. Along the way it became clear: people need something that can carry a payload and leave nothing behind. Nothing toxic. Modern Sprout's Fertilizer Sheets are the first product built on that idea."
Where to buy
Shop Modern Sprout →Available at Modern Sprout starting 8/11.