Lemon trees thrive outdoors in a limited area. They are almost constantly producing new growth and, as a result, are more susceptible to damage from cold weather than many other citrus trees. The winter temperatures of England are far from ideal for growing lemon trees, so the most fool-proof way to raise the trees there is by planting them in a container that is kept by a sunny window and moved outdoors during warm weather.
Line the bottom of a large potting container with a layer of small stones. Choose a container with several drainage holes in the bottom. Fill the potting container three-fourths of the way with a peat-based potting mix.
Plant the lemon tree at the same level it was previously growing and firm the soil well with your hands to remove air pockets. Add water until the soil feels very damp, but not wet.
Place the lemon tree in a location that receives full, southern sunlight most of the day. You can also place the tree outdoors once temperatures reach an average of 21 degrees C (70 degrees F).
Mist the plant each day with a spray bottle. Check the soil often and add moisture when the top 2.5cm (1 inch) of the soil feels completely dry. It is best to give an occasional, thorough soaking to lemon trees instead of small amounts of water frequently.
Fertilize once a month with a general-purpose fertilizer mixed as directed on the package.
Clip off any damaged or dead branches as you notice them. Examine the leaves regularly for signs of pest infestation or disease. Treat promptly with insecticide or fungicide that is safe for use on fruit-bearing plants if you suspect a problem.