Citrus x meyeri (syn. Citrus x limon ‘Meyer’) – Many local gardeners such as Bob Duncan of Fruit Trees & More (North Saanich, BC) are successfully growing these outdoors in Canada. However, he shelters his espalier under a glass awning and covers it with frost cloth during colder weather – using incandescent xmas lights as a heat source. This hybrid has a very sweet flavour. Grows 10-15′ in ground. Zone 9.
Citrus x floridana – This Key Lime x Kumquat cross is a good choice for novice gardeners as it readily produces at a young age. Expect Kumquat-sized fruits which are yellow in colour with a sweet-tasting rind but bittersweet lime-like flesh. ‘Eustis’ is the most common cultivar and it matures into a small tree when planted in-ground. Grows 10 to 12′ high. Hardy to USDA zone 9.
x Citrofortunella mitis – This common container citrus is often found at garden centres around the Chinese New Year – it is a Mandarin orange x Kumquat hybrid. Although the small fruits look like tiny oranges, they actually have a more lime-like flavour which is useful for making marmalade or adding a thin slice to cocktails. Calamondin makes an excellent container specimen where not hardy. 10-20′ in ground. USDA zone 8.
Citron limon ‘Eureka Variegated Pink’ – Not only does this lemon have beautifully variegated foliage and juvenile fruit, but the flesh is a lovely pink with few seeds. This sport of the traditional ‘Eureka’ lemon was first discovered in Burbank California in 1931. This citrus also grows well in pots (which can be brought indoors) for colder regions. Grows 12-15′ high and wide in ground. Hardy to USDA zone 9.
Citrus aurantium var. myrtifolia (syn. Citrus myrtifolia) – The Chinotto Sour Orange or Myrtle-Leaved Orange has striking lance-shaped deep green foliage, fragrant white flowers (which the hummingbirds love) and tart orange fruits. These are used to flavour the traditional Italian orange soda and to make candied fruit or marmalade. The fruits ripen from winter to early spring in the Pacific Northwest. 4-7′. USDA zone 9.