While the stock plant is in the active vegetative growth stage, feed it with a good quality, all-purpose or high Nitrogen fertilizer. One week before taking a cutting feed the stock plants with a low nitrogen, high Phosphorus flowering fertilizer.
The flowering fertilizer will lower the amount of stored nitrogen in the plant and increase the amount of stored carbohydrates necessary for the production of roots. Spraying the foliage with water daily will accelerate this process.