Philadelphus x lemoinei
Mock Orange
Type Shrub, woody plant
Hardy range 5A to 8A
Height 4' to 8' / 1.20m to 2.40m
Spread 8' to 12' / 2.40m to 3.60m
Growth rate Average
Form Rounded and upright or erect
Exposure Partial shade or partial sun to full sun
Persistence Deciduous
Bloom Color White
Bloom Time Spring
Environment This plant tolerates some drought.
This plant will grow in dry soil.
Suitable soil is well-drained/loamy, sandy or clay.
The pH preference is an acidic to slightly alkaline (less than 6.8 to 7.7) soil.
Leaf Color Green
Fall Color No change in fall color
Culture Notes A sight to behold and smell in full bloom, plants perform best in full sun in moist soil. Like many garden plants, those supplied with some organic matter in the root zone before planting make the best growth. Plants offer little after they flower. Might be best located in a shrub border where the plant in smelled but not seen for most of the year. Flowers are extremely fragrant compared to other Philadelphus. This plant is considered mostly allergy free and causes little or no allergy problems in most people.
Philadelphus will not flower following annual hard pruning because plants flower on last year's growth.Planting and establishing shrubsThe most common cause of young plant failure is planting too deep. Plant the root ball no deeper than it was in the nursery. In most instances, the root flare zone (point where the top-most root in the root ball originates from the trunk) should be located just above the landscape soil surface. Sometimes plants come from the nursery with soil over the root flare. If there is soil over this area, scrape it off. The planting hole should be at least twice the width of the root ball, preferably wider. In all but exceptional circumstances where the soil is very poor, there is no need to incorporate anything into the backfill soil except the loosened soil that came out of the planting hole. Never place ANY soil over the root ball. If a row or grouping of plants is to be installed, excavating or loosening the soil in the entire bed and incorporating organic matter enhances root growth and establishment rate.
Weed suppression during establishment is essential. Apply a 3-inch thick layer of mulch around the plant to help control weed growth. Keep it at least 10 inches from the trunk. If you apply it over the root ball, apply only a one or two inch layer. This allows rainwater and air to easily enter the root ball and keeps the trunk dry. Placing mulch against the trunk or applying too thick a layer above the root ball can kill the plant by oxygen starvation, death of bark, stem and root diseases, prevention of hardening off for winter, vole and other rodent damage to the trunk, keeping soil too wet, or repelling water. Regular irrigation through the first growing season after planting encourages rapid root growth, which is essential for quick plant establishment.
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