Why are these watermelon leaves yellowing??
I have three 18 gallon containers with watermelons in them. Using basically the 511 mix...pine bark, peat and perlite. Used some granular fertilizer a couple of times during the season (a little heave on the P for watermelons), and also use a liquid fertilizer at 1/4 strength at every watering, which is about once per day. In the past couple of weeks, these leaves are showing some yellowing, and I have not been able to slow or reverse the trend. This is the only container that's doing this. Any suggestions? I'd like to keep the plant alive for another 6 weeks if possible. There are still 4 melons that need to mature. Thanks. Ed.