May, Jun, Jul, Aug, Sep
At its best:
Jul, Aug, Sep
Plant young tomatoes into greenhouse borders or growing bags when 20-30cm tall. Heap up the soil around the stem, to encourage more roots to form.
Tie in the main stem to a robust cane, to keep it supported. Loop some soft string or twine in a figure of eight around the stem to create a buffer between the two. Don't tie too tightly as the stem will expand as it grows.
Check your plants daily, tying them in as they grow. Pinch out any new sideshoots (little stems that appear where the leaf stem joins the main stem) to ensure all of the plant's energy goes into producing flowers and fruit. Remove the growing tip once four flower trusses have formed.
Many tomato varieties are known as 'cordon' or 'indeterminate' varieties, which means that they are trained as one main stem.
As temperatures rise, water your plants whenever you think they need it - daily or every other day, depending on the temperature. Tomatoes benefit from additional feeding; in particular potash (found in specialised tomato feeds) will keep the plants cropping well. Check the label of the tomato feed you buy to see how frequently you should use it.