Aaron_K

Hi Node,


Okay, that definitely looks like a case of root rot to me. This has been caused by the soil that it is in, which has very poor drainage by the look of it. The soil has become compacted and when water is applied, its basically a swamp. The root in question has probably been starved of oxygen, died and then started rotting and continued its way up the tree, over the winter period.

Japanese maples are a very thirsty tree, but they also like a well draining soil. If you can, plant this tree in some akadama soil, as its the preferred choice for the species. The tree has only just broken bud, and should be OK to repot. I repotted one of my maples after it had been in leaf about 3 weeks (A bit naughty I know and not recommended).

If you don't have any akadama, use 1/3 regular potting compost that has been sieved to remove the fine particles. 1/3 sharp/builders sand 2-3mm grain size, and 1/3 grit. It is very important the compost is sieved, otherwise you will end up with a swamp in your pot again.

The rotten section in question can be used very effectively to make a unique feature of the tree, so I wouldn't be too disappointed by it. Some people actually encourage their trees to rot in some instances, in a controlled manner, so that the tree looks older and adds character.

Leave the wound open to dry out for now, just ensure that the roots aren't damaged too much in the repotting. You should be OK to wash all that crap soil off, and place directly into it the new soil. I did this with mine... and its thriving. As you are wanting to fatten the truck up also, I'd suggest putting it in a large training pot which will allow for good root growth.

Keep us updated. Good luck!

Kindest regards,

Aaron