A fair while back there was a long period of non-stop torrential rain and constant cloud. These guys really suffered as a result.
At the time I thought it was too risky to disturb the roots and add river sand at that point, as they were looking quite sad.
So I moved 4 of them into the sunniest positions.
I removed all the top soil and exposed the surface roots to allow for faster draining. I cut away the pots to allow more sunlight. This improved the drainage rate by two-fold.
This has vastly improved the situation and these remaining 4 are starting to put on new growth now as well.
I didn't do this with them all, as I wasn't sure if exposing the roots so soon would kill them or not.
The ones that I didn't expose the roots and didn't get the top soil removed died.
Do not overpot roots, only use just enough potting mix for roots.
Give at least half-day sun, preferably full-sun
Use a fast draining mix. If the mix isn't dry after 36-48 hours of half-day sun its not draining quick enough.
Allow them to really dry out before they are re-watered. I've not seen one of them die from drying out and I've left them quite dry on the odd occasion before re-watering.
When repotting, tie the roots down into the pot or anchor the roots in, but don’t use extra mix to keep the tree secure.
I suspect that starting with a fast draining mix, giving high levels of sun, slowly reducing the rootball over a decade, not over-potting and not removing a lot of foliage at repotting time, will ensure better success.
My glorious optimism should see me fair better next time.
EDIT: John, that little guy is still powering on that I withdrew from the comp, thats him on the left. If they get a day of full sun, they grow about two leaves per shoot, per day.
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