How do I build a planter box with a tall upright to grow hops on?
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The easiest way for me is to use 4"x4" posts for the corners, leaving one corner taller for the upright. Attach your sides and bottom securely. Alternatively, you could place the upright as the corner of a set of four smaller planters. To do this, attach 4 side boards to each side of the upright, add your bottom (base), place shorter posts at each corner of your base and attach your sides. You could also just build a planter box and stand a piece of lattice up inside before adding your soil.
Hi Debbie! Here's how we made our first raised planter box. I would say just add stakes, a trellis, or tall tomato cage for vertical supports. I've heard hops can get really tall (not sure how heavy they are), so you'll have to bury them deep into the soil so they stay sturdy.
I suppose another option would be to secure the uprights to the planter box itself - perhaps to the 4x4's in a teepee style?