My kitchen is finally mostly done. I just did some dishes, and got the first bit of grey water from the sink. It works pretty well. So I have slightly increased the sustainability of watering my plants.
Some notes for anyone who might be thinking about a similar set up.
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It was pretty tricky finding the right combination of stuff to go from the 1 inch trap drain threads to the 1/2 inch hose.
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The pvc ball valve (white plastic piece with the blue handle) is pretty stiff to open, requiring enough torque to make the hdpe right angle adapter (black plastic elbow between the drain and valve) turn. In the future, I might try to switch to a smaller ball valve in line with the hose, although that may cause other issues.
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The hose needs to be pretty flexible. What I found is clear vinyl hose. It was a 10ft coil. I found the stuff available as per foot to be far too stiff. The downside to such a soft hose is that it is too soft to push fully onto the barbed fitting, but it’s on enough for the hose clamp so it should be fine.
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IMPORTANT. Don’t forget that you have to fill the trap back up, a few seconds of running water will do. If you don’t, sewer gases will be able to come through your drain.