Milk Carton and Rockwool System

Growing Tips Plant seeds 1/4 inch deep in rockwool that has been soaked in a dilute nutrient solution and cut to fit in the milk carton. Place rockwool in a tray of water until seeds germinate. Try to keep the nutrient solution pH between 5.8 and 6.5 and the temperature at about 70 F. Once seeds have sprouted, move the rockwool with the plant to an empty carton every day, pouring new solution over the rockwool into the new carton.

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