If you are using grow bags make sure they are placed on a firm surface, slightly sloping away from your path. If you’re using pots or other containers, the bigger the better, not less than 12 litres per plant; fill them with a good quality peat-free growing medium recommended for containers such as Fertile Fibre Multipurpose Compost or Melcourt Sylvagrow (peat-free, but not organic), both Gardening Which Best Buys.
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