Growing Tips Soak rockwool cubes with a dilute nutrient solution and place a seed in the top of each cube. Cut a styrofoam raft to fit in the container, then cut holes in the raft, spaced 6 to 9 inches apart, to snugly fit the rockwool cubes. Be sure the cubes extend to the bottom of the raft. Poke the aquarium tubing through the raft into the solution. Keep the aquarium pump outside. Fill the container with water around 70 F to within 1 inch of the top, then float the raft with planted cubes on the surface. When seedlings appear, add nutrients to the water at half the recommended strength. Try to keep the pH between 5.8 and 6.5. Let the air pump run continuously. After a week, raise the nutrient solution to full strength and maintain a constant level. Change the entire solution every 2 weeks.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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