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i will likely do some plantings on mounds but will also try some plantings at grade in amendended soil with sand, gravel and pumice,not on valley floor but in foothills, i would think zutano rootstock would be cold harty enough though i would try some duke seeds also if i can locate some in the fall, the grafts and trees boths will be protected if any projected hard freeze comes.i would even try some lula seeds or walden seeds but find it hard to find any and i only know of 1 lula tree planted in cal and its too young to produce any fruit yet. Its unlikey i will have any salt issues but i hear clonal rootstock can also affect growth rate of trees and can have a direct influence on amount of fruit production.
I have small duke trees now but to speed things up will get seeds in oroville this season for dukes in sept/oct. I tryed a mexicola seed the seedling very tiny and slow growing , will take a long time to get big enough to graft, my sister likes to use bacon seeds but i do better with zutanto for myself, a larger faster growing rootstock.