Citrus plants are easy to grow and they are originally from humid Southeast Asia. The most commonly known are lemons, oranges, grapefruit and limes. As well as their fruits the leaves can be used for flavouring in rice, pasta and drinks. Citrus plants are typically non-hardy and in frost prone areas they need winter protection in a heated greenhouse or conservatory. There is nothing better than being able to pick your own lime for your gin and tonic fresh from the garden. If regularly fed, potted on and protected over winter they can reach a height of about 2 metres. They should be watered when the top of the soil becomes dry – however, never let the roots stand in water. They are hungry plants and need regular feeding during the growing season. A citrus will bloom in Spring but some species can bloom throughout the year. They are self-fertile and can produce fruit without fertilisation. You can grow them from seed but it can take many years to reach maturity and produce fruits. They are polyembryonic which means one seed can produce several seedlings. They require a soil type of low acid to neutral pH.