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I have grown petunia & vinca,they grew very well for last 4months with lots of flower but suddenly most of the plants upper leaves turned yellow in color I hv been using 1/2 teaspoon of npk and spaying fungicide regularly once in 15 days also watering twice a day since temprature here in chennai india is max 34c min 24c but still upper leaves turned yellow can anybody help?
it does look like they may need a larger pot. if the roots are too bound up, they won't do well.
it doesn't look like they have a fungus though.
Maybe mix in some coconut husks with the soil. they help retain moisture.
Too much water will also turn the leaves yellow.
p