Poorly courgettes

[Ameliagrey]

Is there any hope? Lots of flowers but leaves turning yellow and crispy. Small fruits are not growing any bigger- about 4 inches long and tiny.

Watering like mad but maybe a virus- or just too little water?

Nope, they're just a couple of weeks behind - mine have come on massively in the heat this week, before then they were rotting on the stem.

You need a teaspoon of Epsom salts in the water to stop the leaves yellowing - doesn't prevent it entirely though. Doesn't affect the fruit though. Remember to feed with tomato feed once a week and water daily if it stays hot.