KNI
Well-Known Member
I'd estimate 7-10 years minimum, may take up to 20. Do not be alarmed that the growth has stalled, it's common. Next years they should go back to 30cm per year growth.It will be a little while until your first walnut harvest!!
https://www.nrs.fs.fed.us/pubs/jrnl/1974/nc_1974_bey_001.pdf
Black walnut trees planted as 1-0 seedlings generally show little, if any, net height growth during the first year.
If you'd ask me I'd say that the first year stall is due to bare root sapplings loosing most of their mycorizza. It takes a while until what's left of the bonded mycorizza to expand to the surrounding ground and start the nutrient and water pumping for the plant.
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