1. Citrus fruits are actually a kind of berry with a tough, leathery rind, known as a hesperidium.
2. A single citrus plant can have as many as 60,000 flowers, but only 1 per cent of those flowers will turn into fruit.
3. Citrus fruits that are grown in tropical climates without a proper winter will stay green on the outside. That’s because citrus fruit needs to get cold to turn orange or yellow.
4. • The lemon is an evergreen, which means it produces fruit all year round.
   • One lemon tree can produce up to 600 pounds (about 300kgs) of lemons a year.
   • Most lemon trees live for about 50 years, but they can live for more than 100 years.
   • The leaves of a lemon tree can be used to make tea and add flavour to cooked meats and seafood.
   • You can make a battery by attaching electrodes to a lemon. Several lemon batteries can power a small digital watch. To power a flashlight bulb, you’d need 500 lemons.
   • The heaviest lemon ever grown was recorded in Kefar Zeitim, Israel. It weighed 5.265 kg (11 lb 9.7 oz), had a circumference of 74 cm (29 in) and was 35 cm (13.7 in) high.
   • Lemons were once presented as gifts to kings because they were so rare.
   • The pomelo fruit is the largest of all citrus fruits, measuring 10 to 30 cm in diameter. Its rough skin can range from a light green to yellow and is also dotted with oil glands.
   • The two main producers of citrus are Florida in the United States and São Paulo in Brazil.
   • Kumquats are the smallest citrus fruit and are quite unique. Unique because, unlike all other citrus fruits, you do not peel them or juice them—you just eat them whole!

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