Calling experienced gardeners: Need help with dying yellow courgette plant!

ahhh pictures! looks like it might be potassium(K) deficiency, which is possible since you were using baby bio untill recently. tomato food with seaweed extract should cure it. id be tempted to use 1 capful tomato food in 2L of water and pour it around the stem of the plant. it should be okay to feed it strongly at the moment. old leaves will not recover, but new ones should be healthier.
 
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oh! That's quite an interesting shift in opinion! I suppose pics tell the whole story where words fail. I will try and OVERFEED it now instead of starving it?!
 
oh! That's quite an interesting shift in opinion! I suppose pics tell the whole story where words fail. I will try and OVERFEED it now instead of starving it?!

haha, cos it sounded like you had been using only tomato food and suffered fert burn and nitrogen deficiency. yes overfeed it once or twice, watch for recovery, then go back to feeding once every 10-14days at normal dose.
 
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