Welp, the potatoes were a bust. They grew, put on flowers, flowers fell off, couple of weeks later they started turning yellow and dying back. They've been a few days without water so I went to dig them since they were starting to get crispy and got nothing. No tubers, nothing that looked like tubers starting to grow, nada. Bummer. My garden is not doing good this year. Still more than I've ever grown! My biggest garden yet. But just not producing a lot.
Time to yank the mustard and the kale. They're done with the heat the bugs.
I have had no luck with root vegetables. I might try digging a row then planting potatoes in straw in that row - sort of straw sunken beds. soil here becomes as hard as concrete, not good for root vegetables.