TreeBay

If you removed 1/3 of the roots, and repot while the tree is still in leaf, at that time, you'd need to take off 1/3 of the foliage to balance the the root system with the leaf surface area.

When a plant is not in leaf, you don't need to do this because the root system has time to regenerate, and the tree will only open the number of buds that the root system can support.

What you've done is remove 1/3 (probably much more, since you took the feeder roots) of the moisture collection capacity of the plant, so it is responding to the stress by shedding leaves, which is the only thing it can do until it has sufficient capacity to hydrate the existing foliage.

Pyracantha is pretty tough. It may shed all the leaves and regrow them. I don't think there is much you can do except not overwater and wait. Again, if it's indoors it will almost certainly die. Put it outdoors, let it drop its leaves and do its thing when the weather warms up.

Regards,

Matt

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