Q: I have a Mexican honeysuckle that I planted last April. It has been doing fine up until now. The leaves in the center of the plant are turning yellow.Β I fertilized the plant when I planted it and it has been on my drip irrigation system. I donβt see any insect problem. Any idea why the leaves are turning yellow?
A:Β Several things including overwatering, underwatering, nutrient deficiencies, and viruses can cause yellowing leaves. From the photo you sent, I see the newer growth looks much better than the older growth. I suspect the recent rains may be attributed to the improved health of the plant and I recommend you adjust your watering schedule to once every 14 to 21 days for the spring, summer, and fall, making sure the water reaches a depth of 24 inches each time.
Peter L. Warren is the urban horticulture agent for the Pima County Cooperative Extension and the University of Arizona. Questions may be emailed toΒ plwarren@cals.arizona.edu
