How Do You Use Rockwool Starter Sheets?

Rockwool is a soil-free growing medium used in hydroponic gardens. It is a combination of melted rock and sand that has been spun into fine thread and compressed into very dense cubes or slabs. It is popular because it can absorb large amounts of water and liquid fertilizer while still holding at least 18 percent oxygen at all times.

This means that growers can use rockwool in place of soil-raised plants anywhere. Rockwool can be planted with cuttings, seedlings or seeds. There are even specific starter slabs designed for growing seeds.

These slabs look a little like large ice-cube trays with tiny holes drilled into the top of each cube. Fill a plastic tub with about two inches of water mixed with two tablespoons of lemon juice. Stir this well.

Rockwool is naturally alkaline; the lemon juice will help to balance its pH so the seeds' sprouting roots won't be burned. Put on your protective gear and unwrap the rockwool slab. Cut small X's in the bottom of each cube, about a half inch ... more.

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