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Native Plant Society of Texas

Canyon Mock Orange

Philadelphus ernestii

Other common name(s):

Canyon Mock-orange, Mock-orange

Family:

Hydrangeaceae (Hydrangea Family)

Plant Ecoregion Distribution Map

This map uses data from the US EPA. EPA  servers have been offline frequently so maps may not display. We are working on a solution.

Edwards Plateau
Balcones Canyonlands, Edwards Plateau Woodland, Llano Uplift, Semiarid Edwards Plateau

Plant Characteristics

Growth Form

Shrub

Height

3
to
5
ft.

Spread

3
to
5
ft.

Leaf Retention

Semi Evergreen

Lifespan

Perennial

Habitat and Care Requirements

Soil Type(s)

Calcareous, Caliche, Clay, Limestone, Rocky, Well Drained

Light Requirement

Part Shade, Shade

Water Requirement

Medium

Native Habitat

Riparian, Woodland

Bloom and Attraction

Bloom Color

White

Bloom Season

Spring

Seasonal Interest

Flowers, Forage, Nectar, Pollen

Wildlife Benefit

Bees, Browsers

Maintenance

Drought and heat tolerant once established. Flowers smell like orange blossoms making it an excellent plant near outside living areas. Doesn’t tolerate wet soil. May be pruned for denser growth soon after flowering. Endemic and rare plant to the Edwards Plateau ecoregion, but is available in some nurseries and NPSOT plant sales. May need extra care when grown outside of its native range. Native habitat: rocky cliffs and other well drained sites near wet areas, near the top of canyons with flowing streams where it cascades over the rocky cliffs, bare rock/talus/scree, solution-pitted outcrops of limestone caprock along mesic canyons, in the shade of mixed evergreen-deciduous woodland.

Description

Blooms April-June: Small shrub with loose bark on the main stems. Leaves narrowly ovate, with smooth margins and 3 prominent veins on the upper surface, the lower surface covered with hairs. Numerous showy, white flowers along branches. The fruit is a capsule shaped like a top.

References

Learn about how to propagate Texas native plants.

Material Treatment Method Collection References
Semi-harwood Cutting Take semi-hardwood stem cuttings: Using clean and sharp pruning shears, take cuttings from the Philadelphus Ernestii shrub. Cut a 4-6 inch (10-15 cm) section of stem just below a node. Ensure the cut is clean and not jagged. Prepare the cuttings: Remove the lower leaves from the stem, leaving only a few at the top. This helps reduce water loss during the rooting process. Optional: You can also dip the cuttings in a rooting hormone powder to encourage root growth. Prepare the planting medium: Fill a small container with a well-draining soil mix. A combination of peat moss, perlite, and sand can be used. Ensure the medium is moist, but not waterlogged. Plant the cuttings: Make a hole in the planting medium with a pencil or your finger and insert the stem cutting into it. Gently firm the soil around the cutting to provide support. Provide the right environment: Place the container in a warm and bright location, but avoid direct sunlight. The ideal temperature for rooting is between 68-77°F (20-25°C). Mist the cuttings: To maintain humidity around the cuttings, mist them with water using a spray bottle. Ensure that the soil remains moist but not excessively wet. Be patient: It can take several weeks for the cuttings to develop roots. During this time, avoid disturbing or moving the container. Transplanting: After the cuttings have rooted and developed a healthy root system, typically after 6-8 weeks, they can be transplanted into individual pots or directly into the garden. The best time to propagate Philadelphus Ernestii is during the early spring or late autumn when the plant is dormant. Look for healthy, disease-free stems to use for propagation. Ideally, choose stems that are about one-year-old, as they have the best chance of rooting successfully. https://plantiary.com/plant/philadelphus-ernestii_23420.html#:~:text=Propagation:%20You%20can%20propagate%20Philadelphus,occasionally%20until%20they%20develop%20roots.

About the Region

2026 Fall Symposium Logo

This low-elevations region of Texas extends inland from the barrier islands, about 60 or so miles, and stretches from Brownsville to Louisiana. In total, it covers about 9.5 million acres, with a high point of 150 feet in elevation. More than 1000 species of plants can be found in this region. On the southern end, species more common in Mexico (such as Sabal mexicana) and Central America occur.

The barrier islands provide us with dune systems, and clay flats to the inland side, which have species found in these areas alone. Many plants here, such as Ipomoea pes-caprae (beach morning glory), can be found throughout tropical regions of the globe. I’ve encountered the same species on the beaches of Guam.

Once inland, vast marshes and wet prairies occur. Occasionally, oak (Quercus fusiformis) groves can be found. Common grasses include species of Bothriochloa, Paspalum, and Sporobolus; eastern gamagrass (Tripsacum dactyloides); and switchgrass (Panicum species). Many rivers and creeks cut through the Gulf Prairies, and along these riparian areas various species of trees, Sabal minor, and other plants adapted to clay soils can be found. Due to overgrazing, farming, and fire suppression, woody species such as mesquite (Prosopis glandulosa) and huisache (Acacia farnesiana), and invasive species such as chinaberry (Melia azedarach), Brazilian pepper (Schinus terebinthifolius), and Chinese tallow (Sapium sebiferum) have increased and displaced our native flora.

Source: Wildflowers of Texas by Michael Eason