I decided to have a go at grinding out the slab to create more of a pot rather than just sitting the trees on top. I think it'll be a bit of an ongoing process - here we are after about 20 minutes and half a grinding disc:
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This of course gives me less of a planting area than my kitty litter tray, so time to repot and move the trees around.
The trees before I started:
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They came out of the tray as one big slab, so plenty of healthy (tangled) roots there:
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I separated each tree and trimmed the roots a fair bit, but didn't worry too much about untangling them - a natural setting on a rock doesn't need to look too perfect or neat IMO. I made a rough tracing of my plantable area and drew it on the inside of the tray to help me place the trees:
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Special shout-out to my supervisor for keeping me in line. I stuck some wooden skewers down to give me something to wire the trees to:
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,..and then roughly plopped in the trees to suit the new planting area, then backfilled with plain old potting mix (I don't need/want too much drainage for these):
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I'll leave them alone again now to recover a bit.
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