Types of citrus

The group is larger than lemons and oranges, and some familiar names sit on more than one scientific label.

Economically important plants in this group include the lemon, lime, sweet orange, sour orange, tangerine, grapefruit, citron and shaddock. Britannica The RHS lists a huge range of citrus plants to choose from, including lemons, oranges, mandarins, limes, grapefruits, kumquats, limequats, calamondin oranges, tangelos and citrons. RHS

If you are new to growing citrus fruit, the RHS says it is best to start with one of the easier types, such as lemons. RHS Certain varieties of kumquats, limes and calamondin oranges can also be fairly straightforward. RHS

• Lemons -- Citrus x limon, a hybrid once thought to be a kind of citron.
• Limes -- several species and hybrids, including Persian and key limes.
• Kumquats -- Citrus japonica in RHS wording, genus Fortunella in Britannica wording.

Yuzu is the most cold-resistant of all citrus fruits, capable of growing at high altitudes at temperatures just above freezing, and is most commonly associated with Japan and Japanese cuisine. Britannica

The RHS notes that calamondins make attractive plants and the fruit is great in preserves. RHS

The fruit and leaves of the Thai lime, or makrut lime (C. hystrix), add distinctive flavour to the cuisines of Southeast Asia. Britannica Finger limes (C. australasica), native to Australia, are noted for their discrete juice vesicles, sometimes called "lime caviar." Britannica