any ideas from you experienced gardeners.
Had great fun growing my own courgettes / zucchini this year - for the first time and I never knew they had such huge prickly leaves.
BUT:

The green 'normal' courgettes, grew and harvested a good crop but the yellow courgettes ALL turned mouldy and withered on the vine when only 2 inches long and I didn't get a single fruit from them.
Am I missing something ?
Did I do somethign wrong ?
Any suggestions ?