Please can someone tell me what the heck is devastating my sunflowers? I have three plants in pots and all are equally damaged. The largest leaves seem most affected and it all happened within a few days. It’s not snails or slugs and there is no sign of aphids or ants.
The stem and so far the flower part (that hasn’t flowered yet) appear undamaged but I bet the appetite of something so ferocious isn’t going to walk/fly away without some serious persuasion.
I've given the whole plant a liberal spray of home -made insecticide made up of vegetable oil, washing up liquid and water, but it's not made any difference.
Any suggestions of who the enemy is and how to get rid of it would be gratefully accepted. Thanks in anticipation