To make a natural organic rooting powder to use when taking cuttings you will need to find a willow tree, any of the Salix species is fine.
Cut off some of this years growth, remove the leaves and cut into one inch pieces. Place these right side/way up (direction is important since rhizocaline- catalyst to promoting root formation travels down the stem of any cutting) in a glass, add 1/2″ of hot water, cover with a plastic bag and let sit 24 hours. Steep your cuttings in this for 24 hours, and then place in the rooting medium. The willow water may be stored in the fridge and covered to prevent contamination, but is best used up within three days.
Ive used this method many times and had excellent results. Also another method I use, which comes in dead handy if your out and about is to take the cutting and lick your clean fingers and gently rub them over the end of the cutting. Not sure why or how this works but it does.
If you have any other organic gardening tips we could use on our allotment please let us know.