At least 24 hours before using your rooting media, pre-condition it with a nutrient solution that's balanced and pH adjusted. Using a reputable manufacturer's complete bloom-based nutrient at 1/4 strength will usually provide a balanced fertilizer charge for your cuttings.
Of course, the concentration and type of nutrients used are somewhat dependent on your rooting media. But one nutrient every grower considers essential is a B vitamin product. This will greatly reduce the stress plants experience during the cloning process.
Here is a brief pH guideline for media presoaking:
Rockwool: This media requires a very acid Ph solution because of its high alkaline nature. Go for a range between 4.5 to 5.0
Peat pellets: pH 6.3
Compost/polymer plugs: pH 5.8 to 6.3
Coco Coir: pH 6.3
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