How To Prepare Rockwool For Horticulture Use

How to prep and treat Rockwool for horticulture use:
1. Place Rockwool in the seed flat or other container to soak. You may want to wear gloves when handling dry Rockwool to avoid skin irritation.
2. Add water with a pH of no lower than 5.5 and no higher than 6.5 for 30 minutes. To reach a pH of 5.5-6.5 you can either use a commercial pH lowering product or lemon juice. For precise results, I recommend testing the pH of the water as you add the pH lowering substance.

I used a ph kit I have for soil which worked just fine. Turns out our well water was within the recommended range without any adjustments. You can use the general recipe of juice of ½ lemon to 1 gallon of water to lower 1 pH point.
3. After soaking for 30 minutes, drain water and rinse with more water with 5.5-6.5 pH. It’s important not to squeeze the rockwool at this point.

4. Plant!

About Rhi

Rhi enjoys spending time with her family and working on the homestead. During spring and summer she is often found tending to her garden, and mini-orchard.

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