Posted: 23/06/2013 at 16:49
I agree with Dove.
And....GC/store bought compost has been fairly unreliable for the past couple of years. With home grow stuff at least you know whats in it. As for introducing pests, this can also happen with new plants bought for the garden, you take your chances.
Try making more of your own stuff, I have leaf mould, muck and a dalek on the go for next year. It all gets mixed together in a wheel barrow along with bought compost...if you fill big pots it can work out expensive to buy.
Try recycling some of your old compost. I save the compost from my spud bags, mix it with fertilser to add nutrients and either put it on flower beds as a mulch or use it for plants which need re-potting. You need to make sure all the spuds are out though, other wise you get random spud plants popping up everywhere