'Mickie' rock rose forms a mound of gold and green evergreen foliage topped with white flowers in early summer.

Citrumelo (xCitroncirus) is a cross between a grapefruit and the very hardy trifoliate orange (Poncirus trifoliata) and tastes like something between the two. It is hardy outdoors on the west coast.

Citrus (formerly Microcitrus) australasica, the Australian finger lime, is a lime relative from Australia and a top citrus for foodies.

Citrus (formerly Microcitrus) australasica, the Australian finger lime, is a lime relative from Australia and a top citrus for foodies.

Citrus australasica Red Skin can have fruit with skin with a reddish cast hiding the tasty, clear lime caviar within.

Citrus bergamia, or bergamot, resembles an orange in shape, but is green or yellow like a lemon.

Citrofortunella mitis is a small, beautiful shrub with large crops of fruit known as calamondin or calamansi in Philippine cuisine.

Citrofortunella mitis is a small, beautiful shrub with large crops of fruit known as calamondin or calamansi in Philippine cuisine.

Citrofortunella mitis ‘Variegata’ has variegated foliage, fragrant white flowers, and large crops of variegated fruit.

Citrofortunella mitis ‘Variegata’ has variegated foliage, fragrant white flowers, and large crops of variegated fruit.

Citrus medica 'Assads' forms fragrant lemon-like fruits with thick peel called an etrog. They are used for the Jewish Feast of the Tabernacles (Sukkot).

Citrus medica 'Etrog' forms fragrant lemon-like fruits with thick peel that are used for the Jewish Feast of the Tabernacles (Sukkot).

Citrus medica var. sarcodactylis is a unique citron called the Buddha's hand lemon which bears striking, bright yellow fruit with fingers.

Citrus medica var. sarcodactylis is a unique citron called the Buddha's hand lemon which bears striking, bright yellow fruit with fingers.

Citrus x paradisi 'Oroblanco' forms large, flattened fruits with white flesh that are sweet without the bitterness of regular grapefruit.

Citrus x paradisi 'Oroblanco' forms large, flattened fruits with white flesh that are sweet without the bitterness of regular grapefruit.

Citrus x paridisi 'Rio Red' produces delicious orange-sized grapefruits with reddish-orange flesh and a yellow rind flushed with salmon.

Citrus x paridisi 'Star Ruby' produces large six inch wide fruit with yellow orange skin that blushes rose when ripe.

xCitroncirus forms large grapefruit-sized fruits that are yellow to light orange with thin skin and a flavour like a cross between a lemon and a grapefruit.

'Dunstan' citrumelo forms large grapefruit-sized fruits. It is easily hardy to zone 8 and most likely zone 7!

Citrus 'Cocktail' forms large grapefruit-sized fruits that are bright yellow and very juicy.

Citrus 'Cocktail' forms large grapefruit-sized fruits that are bright yellow and very juicy.

Citrus x paradisi 'Melogold' is similar to 'Oroblanco' but with a thinner, more golden skin, larger fruit, and slightly higher juice content.