Two 4×4×8 ft posts for a grape trellis in Central California. Homeowner plans to set them in 6×8 concrete blocks.
Posts must be 24 in deep in concrete, not blocks. Mature grape vines are heavy; wind load on foliage is high. Blocks provide no uplift resistance.
Blocks sit on grade; frost heave (even minimal) and soil movement will tilt them. Concrete footing anchors the post against all forces.
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