Lemons are a variety of Citrus, which grow on attractive, ornamental evergreen trees, usually reaching a height of up to 1.8m (6ft). They are not reliably cold hardy in Britain, so are best grown outside in containers from late spring/early summer to the beginning of autumn, and then brought inside for the winter.Lemon trees produce lovely, white, fragrant flowers that may appear all year round, but more profusely during late winter. The fruit ripens in around 12 months, so trees may be in flower and fruit at the same time. They are self-fertile, so you will only need to grow one tree to get fruit.They don’t make great houseplants, as they need plenty of light and most rooms – apart from a conservatory – aren’t really light enough or suitable. They dislike central heating, as this makes rooms too hot and stuffy with a lack of essential humidity.