TreeBay

Doug Philips and Larry White do a lot of collecting in the Sierras, and some plants had to be "prepped" years in advance. This is a technique that might work for you. The did top pruning, perimeter root pruning, fertilizing, and even contrived some devices to collect rainwater and divert it to the plants' root zone.

I don't know the specifics of the perimeter treatment, but usually it involves backfilling a trench dug around the plant with soil with a preferable structure.

Regards,

Matt

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