Key Facts
- Evergreen multi-stemmed shrub with pinnate leathery leaflets
- Fragrant yellow flower racemes appear in late winter to early spring
- Produces blue-black berries after flowering
- Tolerant of a range of soils if well drained
- Prefers part shade but will tolerate sun in cooler areas
- Can spread by suckers and seed and is considered invasive in some warm humid regions
- Commonly propagated by seed and cuttings
- Contains alkaloids that can cause stomach upset if ingested
Leatherleaf Mahonia is an evergreen multi stemmed shrub prized for fragrant yellow flower racemes that appear in late winter to early spring. It provides year round foliage and winter interest but can spread from suckers and seed in warm humid areas.
Identification
Leaves are pinnate with leathery leaflets that give the shrub a bold evergreen texture. Plants typically reach six to ten feet tall with a spread often five to eight feet from multiple stems. After flowering the plant produces blue black berries that follow the erect yellow racemes.
Where to grow and best uses
Leatherleaf Mahonia suits shady to partially shaded sites where evergreen structure and winter bloom are wanted. Use it as an understory specimen, informal screen or foundation shrub in milder temperate gardens. Avoid planting where natural areas could be seeded or where vigorous suckering would be a problem.
Planting and spacing
Allow space for a mature spread of five to eight feet and place plants where suckers can be monitored. Set the rootball level with the surrounding soil surface and firm soil around roots. Mulch to conserve moisture and reduce weeds while preserving good surface drainage.
Soil and watering
Plants prefer moist fertile well drained soil and tolerate clay when drainage is adequate. Avoid waterlogged sites which lead to root decline. Water to establish new plants until roots are settled and then reduce supplemental irrigation where soils remain evenly moist.
Light
Best performance comes in part shade to full shade with tolerance for morning sun. In cooler climates Leatherleaf Mahonia may take fuller sun but hot afternoon exposure can produce leaf stress. Choose a sheltered position in hot or exposed gardens.
After flowering and maintenance
After bloom leave flower stems if you want seasonal interest or remove spent racemes to reduce seed set. Remove dead or crowded stems and thin clumps to improve air circulation. Routine light pruning maintains shape and helps keep the plant within its allotted space.
Controlling spread and invasive potential
This species spreads by both suckers and seed and can naturalize in warm humid regions. Control starts with removing unwanted suckers and cutting or disposing of berry clusters before they ripen. Dig out persistent suckers at the crown and remove seedlings early to prevent colony formation.
Propagation
Common methods include seed, softwood or semi ripe cuttings, layering and division of suckering clumps. Seedlings can vary from the parent so cuttings are useful to preserve specific traits. Time and technique for cuttings varies by climate so consult local extension resources for regional timing.
Frequently asked questions
- How fast does Leatherleaf Mahonia grow?
- Growth rate varies with site and climate, but plants commonly reach six to ten feet tall under garden conditions.
- When does Leatherleaf Mahonia bloom?
- Fragrant yellow racemes appear in late winter to early spring in many climates, with exact timing depending on local conditions.
- What spacing does Leatherleaf Mahonia need?
- Plan for a mature spread of about five to eight feet and space plants accordingly to avoid overcrowding and reduce suckering pressure.
- How should I control suckers and seedlings?
- Remove suckers at the crown and pull seedlings while small. Cutting or removing berry clusters before they ripen reduces seed spread.
- What soil does it prefer?
- It prefers moist fertile well drained soil and tolerates clay when drainage is good. Avoid waterlogged areas to prevent root problems.
Related Plants
