Question: My wisteria’s leaves are almost pure white. What are they lacking?

Answer: Iron. Your soils are probably extremely alkaline, and the first signs of iron chlorosis would be yellowed leaves with dark green veins on the newest growth first. With wisterias, however, the veins aren’t very prominent, so the plant’s newest leaves take on an overall yellowed appearance. Very quickly, the deficiency becomes so bad that the leaves have no chlorophyll at all. Use an iron/sulfur soil-acidifier material to correct the problem. Several applications may be necessary each growing season.