United Kingdom

I have just had a two feet high double wall built round my patio with the idea of planting annuals so there is always something nice to look at. Can you please advise me as to what kind of compost/soil I should use to fill the space between the two walls. Bearing in mind that this will be there forever, should I add water-retaining pellets and food granules and will this need to be done every year? Also will I need to add worms?

• 24 Mar, 2008

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building raised beds