Robinia pseudoacacia 'Inermis' Standard (Mop Top Robinia)
Robinia pseudoacacia 'Inermis' Standard (Mop Top Robinia)
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Robinia pseudoacacia 'Inermis' Standard, commonly known as the Mop Top Robinia, is a compact deciduous ornamental tree prized for its perfectly rounded, dense canopy and low-maintenance nature. Grafted onto a clear standard trunk, it forms a neat ball-shaped crown of fine, fern-like green foliage that provides soft texture and attractive shade throughout spring and summer. In autumn, the foliage turns a warm golden yellow before falling, adding seasonal interest.
Unlike the species, 'Inermis' is virtually thornless and typically does not produce flowers, making it an excellent choice where a clean, tidy appearance is preferred. Hardy, drought tolerant once established, and adaptable to a wide range of conditions, the Mop Top Robinia thrives in full sun and well-drained soil. It is ideal for streetscapes, driveways, courtyards, formal gardens, commercial landscapes, and feature planting where its symmetrical form creates year-round architectural appeal.

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Mature height
4–6 m (depending on graft height and maturity)
Mature width
3–5 m
Spacing
3–5 m
Evergreen/Deciduous
Deciduous
Foliage
Fine bright green foliage turning golden yellow in autumn; flowers are rare or absent
Flowering Period & Fruit Development/Harvest
Not significant
Sun tolerance
Full Sun
Maintenance
Low
Root System
Deep, spreading root system; generally non-invasive when planted with adequate space