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CITRUS sinensis 'Roble'

Image of Citrus sinensis 'Roble'

Carol Cloud Bailey



Botanical Name

CITRUS sinensis 'Roble'

Plant Common Name


Special Notice

This entry has yet to be reviewed and approved by L2G editors.

General Description

The cultivar ‘Roble’ is an early to mid winter sweet orange. It produces medium sized, round fruit, flattened at both ends with medium pebbled, tight orange skin. The flesh is richly flavored, juicy, firm and moderately seedy. The trees have an upright habit, are vigorous, productive and tend toward alternate bearing, which means they produce a heavy crop one year and a lighter crop the next if fruit is left on the trees too long.

A day without orange juice is like a day without sunshine and many people agree. The juice of sweet oranges has become a dietary staple of millions worldwide. No trees of Citrus sinensis exist in the wild today, but probably originated in China, northeastern India, and southeastern Asia. They were eventually moved along Asian trade routes to Africa, the Mediterranean and Europe where those of wealthy means established orangeries. Spaniards brought oranges with them to South America in the 1500s and from there they were introduced to the United States on several occasions. Today, this luscious fruit is grown commercially and in backyards in warm, subtropical regions the world over.

Sweet orange trees are medium to large, evergreen and have rounded crowns covered with glossy, elliptical, fragrant leaves occasionally with slightly winged stems and minute teeth along the edges. The branches sometimes have flexible, blunt thorns. Flowers appear from winter to spring and may be single or clustered. In bud they are red or purple-hued and open to reveal white fragrant blooms that are highly attractive to honeybees, which produce orange blossom honey.

Cold sensitive, orange trees prefer locations with warm, dry winters, and cool summers; they will tolerate temperatures a few degrees below freezing for only a few hours. They require full sun and are tolerant of most soils, even poor soils, with ample drainage. Though moderately drought tolerant once established, they must have regular applications of water for good fruit production. Regular fertilization is also required as they are heavy feeders. The trees are generally self-pruning and only require removal of water sprouts, low branches and damaged or crossing limbs. Orange trees need plenty of space for their crowns to grow. They are grafted on to rootstocks, which impart tolerances to soils, pests and climate conditions.

The whole of the orange tree is usable. The fruit is used culinarily and medicinally, the wood for furniture, the pulp for animal feed and the oil from the skin is extracted and used industrially, for cleaning, as a pesticide and to scent everything from soap to perfume. Plant sweet orange in tubs or as conservatory specimens where not hardy and in the home orchard for the versatile, tasty fruit and to attract the North America giant swallowtail butterfly which uses this and other citrus as larval food.


  • AHS Heat Zone

    10 - 9

  • USDA Hardiness Zone

    9 - 11

  • Sunset Zone

    H1, H2, 8, 9, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24

  • Plant Type


  • Sun Exposure

    Full Sun

  • Height

    6'-40' / 1.8m - 12.2m

  • Width

    6'-20' / 1.8m - 6.1m

  • Bloom Time

    Early Spring, Spring, Late Winter, Indeterminate

  • Native To

    Southeastern Asia, China

Growing Conditions

  • Soil pH

    Acidic, Neutral

  • Soil Drainage

    Well Drained

  • Soil type

    Loam, Sand

  • Growth Rate


  • Water Requirements

    Drought Tolerant, Average Water

  • Habit


  • Seasonal Interest

    Spring, Summer, Fall, Winter

Ornamental Features

  • Flower Interest


  • Flower Color


  • Fruit Color

    Orange, Orange Red

  • Foliage Color (Spring)

    Dark Green

  • Foliage Color (Summer)

    Dark Green

  • Foliage Color (Fall)

    Dark Green

  • Foliage Color (Winter)

    Dark Green

  • Bark Color

    Gray Green, Gray

  • Fragrant Flowers


  • Fragrant Fruit


  • Fragrant Foliage


  • Bark or Stem Fragrant


  • Flower Petal Number


  • Repeat Bloomer


  • Showy Fruit


  • Edible Fruit


  • Showy Foliage


  • Foliage Texture


  • Foliage Sheen


  • Evergreen


  • Showy Bark


Special Characteristics

  • Bark Texture


  • Usage

    Container, Edible, Feature Plant, Fruit / Fruit Tree, Hedges, Mixed Border, Screening / Wind Break, Topiary / Bonsai / Espalier, Tropical

  • Sharp or Has Thorns


  • Invasive


  • Attracts

    Birds, Butterflies

  • Self-Sowing