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These dwarf fruit trees grow can be grown directly in the ground or in pots. I grow mine in pots. They can be moved if I wish depending on the weather. They grow to approximately 1.5m (5ft). You could put several fruit trees in the space you have available. I have the Dwarf Compact Stella and Dwarf Pear at home. Both are good fruit produces here in the North East of England. I already have 2 apple trees at the allotment. http://www.bakker.co.uk/index.aspx?Ntt=dwarf+fruit+trees&Ntk=NL&Ntx=mode+matchallany&Nty=1&N=0&D=dwarf+fruit+treesDon't forget trusted favourite, rhubarb. Timperley early and Victoria will ensure a good supply from March - August.
Check out some of the deals here. This place is great, and cheap!http://www.blackmoor.co.uk/index.php
A Jostaberry will give you more "blackcurrants" than you would ever need and they are larger than true currants being a gooseberry cross... :)