What is the best pot to grow an orange tree in (jaffa)?

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The best pot to grow an orange jaffa tree in is one that is heavily insulated. These trees are very delicate to the cold. Also if it's just starting to grow, it can take up to 5 years before you'll ever see fruit. Now, I am not sure where you are from. but most likely the pot needs to be heavily insulated. to do this you can cover the base and wrap around pipe insulationAs the tree grows, its trunk will become stronger and less susceptible to cold damage. If growing in a pot, be careful that the roots don't freeze, as this could kill your plant.
feed it with a specialist citrus plant fertiliser, which should have the right combination of nutrients for it to grow, flower and fruit. I sometimes add Sulphate of Potash (Potassium Sulphate) to some of my plants, to 'encourage' flowering. Potassium is the element that is needed for flowering to occur.