By Flodden
Berwickshire,
United Kingdom 
My courgette leaves are turning yellow, well the outside one's are but the plant looks OK in general and is starting to fruit. It's outside in a sunny spot and well fed and watered just wondering if it needs a special feed?
5 Jul, 2011
I would use a feed that had high nitrogen, low phosphate, and moderately high potash, such as 24-8-16. Tomorite and the like have too much phosphate, and too little nitrogen.
6 Jul, 2011