Shrub
Japanese Mock Orange
Pittosporum tobira · Pittosporaceae
Also called: Pittosporum, Mock Orange, Japanese Cheesewood, Tobira
Japanese Mock Orange (Pittosporum tobira) is a low-water shrub well suited to Tucson and the low desert. It thrives in full sun to partial shade, with a moderate growth rate. Expect creamy white aging to yellow blooms Very fragrant flowers in spring.
Japanese Mock Orange at a glance
- Water use
- Low (established)
- Sun
- Full sun to partial shade; tolerates Tucson full sun but green-leaf forms appreciate afternoon shade in the hottest reflected-heat sites. Variegated forms ('Variegata') prefer more shade as they scorch in intense sun.
- Mature size
- Species 8-12 ft tall and wide if unpruned; dwarf 'Wheeler's Dwarf' stays 2-3 ft, variegated forms 4-6 ft.
- Growth rate
- Moderate
- Bloom
- Creamy white aging to yellow, Very fragrant flowers in spring (March-May) with a sweet orange-blossom scent (source of 'mock orange' name).
- Cold hardiness
- Hardy to about 15-20°F; frost-sensitive in hard Tucson freezes — foliage and tips can be damaged below the low 20s°F. Provide frost cloth protection during hard freezes, especially for young plants; usually recovers from cold damage.
- Soil
- Adaptable; tolerates alkaline Tucson soils and a range of textures with good drainage. Benefits from organic amendment and mulch; avoid soggy soil.
- Native range
- Japan and China
- Best used as
- Screen or informal hedge, Foundation planting, Mass planting (dwarf forms), Fragrant accent near patios and entries, Container plant
- Wildlife
- Fragrant spring flowers attract bees and other pollinators; orange seed capsules provide minor bird interest.
- Toxicity
- Generally regarded as non-toxic / low-toxicity to pets and humans; not on major poison lists, though ingestion of foliage may cause mild stomach upset. Low concern around pets and children.
How to grow Japanese Mock Orange in Tucson & the low desert
Watering
Water regularly to establish; once established it is moderately drought-tolerant — deep-water every 7-10 days in summer and every 3-4 weeks in winter for good appearance. Tolerates some drought but looks best with periodic deep irrigation.
Fertilizer & nutrients
Apply a balanced or slow-release shrub fertilizer in spring; light feeding is adequate. Correct alkaline-soil iron chlorosis (yellowing) with chelated iron if it appears.
Pruning & care
Prune to shape in spring after bloom; tolerates shearing for hedges but looks best lightly hand-pruned to preserve its natural mounded form. Can be limbed up into a small multi-trunk specimen. Avoid heavy pruning right before frost.
Notes
A popular, fragrant, dense evergreen for low-desert screens and foundations; dwarf 'Wheeler's Dwarf' is widely used for low mass plantings. Watch for aphids, scale, and sooty mold, and protect from hard frost. More cold-tender than myrtle, so site in a warm microclimate.
Sources: University of Arizona Cooperative Extension / Pima County Master Gardeners; AMWUA Landscape Plants for the Arizona Desert; Reputable Southwest horticulture references