I have been using this technique now for over ten years and I have finally decided to share what I have learned. The technique is known as ‘sweating’ and is used extensively in arboretorial circles. I use for the following species: Cratageus, Prunus, and most of the Rosaceae family, do not use on evergreen species.
I collect trees with as much root as possible, but I have put roots on trees that have not had any.
Follow this procedure and your success rate in establishing your freshly collected yamadori will improve immeasurably.
- Collect as much root as possible
- Clear as much mountain soil but do not wash the roots
- Use the soil mix as shown below
- Clean cut the major roots as close to the trunk without spoiling the nebari
- Place the tree in the smallest container possible
- Ensure that the tree is well packed in the container
- Wire the tree securely in the pot
- Make sure that the cut branches are clean and NOT SEALED
- Saturate the soil
- Pile fresh sphagnum moss on the surface of the container
- Wrap the whole tree in a VERY large black plastic bag
- Place in a sunny position as the tree MUST GET HOT
- Humidity in the bag must be high at all times, mist spray daily
- After two or three weeks new buds will appear particularly around the cuts
- Ensure that they do not touch the sides of the bag.
- When the new shoots reach 5cm or 2” remove from the bag and protect from cold and wind, mist spray daily and keep out of direct sunlight.
- Keep watch for the new shoots hardening off, then you can feed with a very diluted solution; do not work the tree for the first 12 months.
Good luck, please do not copy these photos or the text, and share the link freely.