Hello, I am thinking of using 3600mm treated pine posts to use for espaliering. How deep should the posts be sunk? Likewise if I use 2600mm posts.
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You might need to tell us a little bit more so members can assist. Are you planning to concrete the posts? Do they need to hold any weight? How long are they? If you could share a sketch or a photo, it would be even more helpful.
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I have peach and lemon tree espaliered.
I would consider Cypress Pine post over treated pine. Cypress will out last treated and there are no chemicals used in cypress, cypress stands up to the weather much better, they do cost a bit more but do the job better The hole needs to be at least 600mm min if weight is being applied to them. Use rapid set to set the post into the ground
Here is a link for further info https://outlast.com.au/assets/pdfs/durable-timbers/Cypress_Fact_sheet.pdf
and for a cold winters night sitting next to a warm fire with a glass of good red som extra reading https://outlast.com.au/assets/pdfs/durable-timbers/Australian%20Hwd%20and%20Cypress%20Technical%20gu...
hope this help