June 5, 2015
Zone 8 or 8B
Jerusalem artichokes leaves brown with white patches and no flowers yet. I have 12 Jerusalem artichokes that are now about 4 feet tall. One has slowly had its leaves turn sickly dark brown, and one has white on the back. Now the plant next to it has a leaf turning the same. Could it be due to overwatering, or some pest or disease? This is my first year to plant them. They are in a new bed with mostly amendment, hardly any regular soil. I live in zone 8 in Safford, AZ. I have been watering them every day.
June 6, 2015
You are looking for evenly moist soil. You need to check the soil before watering to see if it needs to be watered.
Inspect the leaves for any signs of insects. Neem Oil is a good treatment if you find anything.
Here are a couple of links.