Mar, Apr, May
At its best:
Jul, Aug, Sep
If making your own growing ring, start by cutting the bottom from a 20cm-diameter plastic pot using secateurs. If not, simply cut a hole in your growing bag and place the growing ring over it.
Plant the tomato in the compost, stake, firm and water well as you would normally. Then, add a 2-3cm layer of compost to the pot every 10-14 days, until it's full. Try to water the plant daily and give it a liquid feed every week.
Remove sideshoots from plants as you would normally. When fruits start to develop, remove leaves which would otherwise shade them, so they ripen fully.