Transcendent crab was discussed last time this topci came up. Building up the soil in a spot would be helpful. Even if its like 5 or 10 gallons of soil. I would possibly delay mulching and / or weedmat on the spot until summer. LEt it dry out soem during it's 1st wet spring.
Got some transcendent from willis orchards. If anything, skip grafting for the 1st year and plant them. Alteast some. Evaluate what grows well 1st, anything that dies you might be attribute to a failed graft.
Saw P18 at cummins nursery in NY. Petty sure they're sold out by now. M111 handles heavy soils. Heavy soil usually mean wet ones. Worth testing in the mix.