Posted: 13/05/2012 at 20:43
using just multi purpose compost would be very wrong. 1. the nutrient levels are quite low and don't last long. 2. it is likely to dry out quite easily, turn to dust and blow away. 3. whilst too much water will turn into a sodden sump. Over watering plants is worse than under watering.
I'm no expert, but a decent top soil will add bulk and stability + the well rotted manure is good for water retention and nutrients = awesome veg! Simples.
Not sure about squashes since I've never grown them, but Monty shows exactly how to plant courgettes on this forum and you can't go wrong with Monty