• Blood oranges are among many dwarf citrus varieties suitable for greenhouse cultivation.half of a blood orange on a red background image by David Smith from Fotolia.com
  
  Four Winds Nursery in California was the first to commercially graft and sell dwarf citrus trees, accomplishing for citrus trees what had already been done for apples and pears. Dwarf fruit trees can successfully be grown in the home landscape and in containers for patios or greenhouses. According to Four Winds, you can grow most dwarf citrus trees in solariums or greenhouses, where a subtropical environment is achieved by keeping temperatures 55 to 95 degrees Fahrenheit.
  
  

Blood Oranges

• These tasty oranges, derived from a cross between an orange and a raspberry, are immensely popular in the Mediterranean for sweet, brilliantly colored fresh juice. Warm days and cool nights produce the sweetest fruit. The "Moro" blood orange is very productive, with early maturing, aromatic fruit with purple-red flesh and berry-like flavor. The "Sanquinelli" cultivar is tart and spicy, with both deep-red juice and rind. "Tarocco" produces the largest blood oranges, but the quality is short-lived.
  
  

Mandarin Oranges

• Growing your own mandarins offers the opportunity to enjoy varieties not commonly available. The gold-colored "Gold Nugget" mandarin produces mature fruit in March, and mandarins hold their sweetness and quality on the tree through summer. "Tango," introduced by the University of California, is a seedless, very sweet, deep-orange Moroccan-type mandarin that matures in January and keeps on the tree well into spring. The very hardy "Owari" Satsuma mandarin matures in November and December. "California Honey" produces its sweet fruit in early spring.
  
  

Lemons

• Everyone needs their own lemon tree, and the classic "Eureka" lemon bears year-round and produces large crops. The sweeter, less-acidic "Improved Meyer" lemon is greatly appreciated by gourmet cooks and also produces year-round, but most heavily in winter. Make your own pink lemonade with the "Variegated Pink" lemon, which is most appreciated for its variegated green and yellow foliage and fuchsia-toned buds and new growth. These lemons do have pink flesh, and produce clear juice and an acidic lemon flavor. Or grow a Mediterranean lemon variety prized by citrus connoisseurs for distinctive character and flavor, such as "Villafranca," which was introduced from Sicily around 1875.
  
  

Limes

• In tropical climates, ripe limes stay green on the tree, yet in California they turn yellow. "Bearss Seedless" are true limes, producing fruit year-round, and are particular good for cool areas. Use the leaves, zest and juice of the bumpy "Kaffir" or Kieffer lime in Cambodian, Indonesian and Thai dishes. The "Thornless Mexican" or Key lime offers all the pungent flavor preferred for Key Lime pie without the pain. The "Palestine" sweet lime is mild-flavored and less acidic than the Bearss lime, ideal for refreshing juice drinks.