Choisya dumosa var. arizonica 'Whetstone'

RHS Plant Profile

Mexican orange 'Whetstone'

Synonyms

Choisya arizonica 'Whetstone'

Shrubs

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An evergreen shrub, with dark green leaves divided into five narrow leaflets with slightly scalloped edges. Clusters of large, lightly scented white flowers are produced in late spring or early summer. Leaves sometimes tint red in winter

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

1-1.5 metres

Max Spread

1-1.5 metres

Size

Time to Maturity: 5–10 years
Max Spread: 1-1.5 metres
Max Height: 1-1.5 metres

Growing Conditions

Chalk Loam Sand

Moisture: Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun

Aspect: South–facing or West–facing
Exposure: Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H3
Drought Resistance: Yes

Colour & Scent

Fragrance Flower

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Rutaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Bushy
Genus: Choisya are evergreen shrubs with aromatic, palmately divided leaves and fragrant star-shaped white flowers
Name Status: Unresolved

How to Grow

Cultivation

Grow in a sheltered position in full sun; needs excellent drainage and will not tolerate winter wet. Provide winter protection in all but the mildest areas, or grow in containers that can be moved indoors over winter

Propagation

Propagate by semi-hardwood cuttings

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Mediterranean climate plants
Conservatory and greenhouse
Flower borders and beds
Wall side borders

Pruning

Pruning group 8

Pests

May be susceptible to red spider mite and snails

Diseases

May be susceptible to honey fungus