Hi Lotty. I've tried a number of different ones in recent years, but my favourite is Miracle Gro. However, at the beginning of the year I couldn't find a good price for it so I bought some Westland multi purpose with added John Innes. I wasn't that pleased with the results from it, so when Wickes had a deal on a while back, I went back to MG. I know there are other probably better ones out there, but they tend to be quite expensive. I'd be interested to hear others recommendations?