Rockwool Cubes

  1. Prepare the rockwool cubes for use, making sure to soak them in pH adjusted water to bring their pH down between 5.5 and 6.5.
  2. You can add a few drops of lemon juice or pH down to the water, or use pH test strips. 
  3. Add nutrients to the water. You can use a mild vegetative hydroponic nutrient solution, or add a teaspoon of rapid start for every five gallons of water. 
  4. How to use FloraGro with seedlings?
    A general rule of thumb is to use 1/4 teaspoon of each FloraSeries nutrient per gallon of water for seeds, cuttings, or delicate seedlings. 
  5. Soak for 5 hours.
  6. Drain with a strainer for 1/2 to 1 hr.
  7. To Plant Seeds:
    1. Insert 2 seeds in the hole on the top of the rockwool cube. Use a toothpick or other similar object to press the seeds down to the bottom of the hole.
    2. Pinch the hole closed.
    3. Place the cubes in a nursery tray and cover with a humidity dome to lock in moisture.
    4. Maintain at 70 – 80°.
    5. Keep rockwool cubes moist by watering sparingly every couple of days or misting with a spray bottle when they start to dry out.
    6. Remove from humidity dome and place under lights as soon as seeds sprout.
    7. Cut the tops off the seed in each cube (if you planted 2 per cube) that isn’t the strongest or tallest. Do not pull them out as it may dislodge the healthier plantlet at the same time.
    8. Transplant when plantlets reach 2-3” in height.
  8. To Propagate Cuttings
    1. Water the stock plant well the night before beginning the propagation process.
    2. Remove a 3-4” leaf stem cutting from the main stem of the plant, cutting it off as close to the main stem as possible without damaging the node.
    3. Dip cut end in rooting hormone.
    4. Plant the cutting in the rockwool cube making sure it doesn’t poke out the bottom of the cube.
    5. Fill a nursery tray part way full with perlite or vermiculite.
    6. Set rockwool cubes on top of growing media.
    7. Cover nursery tray with a humidity dome to lock in moisture.
    8. Maintain close to 80°.
    9. Crack humidity dome when roots begin to emerge, gradually increasing the day after.
    10. Remove the humidity dome a couple of days after roots first appear.
    11. Transplant when roots begin to poke out the bottom of the cubes.
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