Key Facts
- A thornless variety of honeylocust used as a shade and street tree.
- Deciduous leguminous tree with pinnate or bipinnate compound leaves.
- Small fragrant creamy white flowers appear in late spring.
- Develops flat beanlike pods later in the season.
- Adapts to a wide range of soils and tolerates urban conditions.
- Prefers full sun and shows best form with good light.
- Cultivars are commonly grafted to preserve thornless and form traits.
Thornless Honeylocust is a thornfree form of honeylocust used widely as a shade and street tree. It adapts to a range of soils and produces clusters of small creamy white flowers in late spring followed by flat beanlike pods later in the season.
Identification
This deciduous leguminous tree has pinnate or bipinnate compound leaves that offer light filtered shade. Mature trees commonly reach between 30 and 70 feet tall with a crown spread typically in the 30 to 50 foot range. Named thornless varieties are usually grafted to keep the thornfree trait.
Best uses and where to grow
Use Thornless Honeylocust as a park or street tree for filtered shade that lets lawn and understory plants grow. It tolerates urban soils including clay and alkaline ground and performs best in full sun. Avoid sites with poor drainage because wet soil can cause decline.
Planting and spacing
Plant thornless honeylocust where it has room to reach a 30 to 50 foot crown spread. Give young trees generous root space from buildings and overhead utilities. If selecting a grafted cultivar avoid planting so close to structures that future pruning will be required to contain the canopy.
Soil light and watering
Prefers well drained loam but tolerates clay and alkaline soils. Full sun produces the best form and most reliable flowering. The tree becomes drought tolerant once established but prolonged waterlogged conditions will lead to decline, so choose a site with good drainage.
After flowering and maintenance
Small fragrant creamy white flowers appear in late spring and flat beanlike pods develop later in the season. Prune to shape and remove crossing branches in dormant months. For grafted cultivars cut above the graft union to avoid encouraging rootstock suckers.
Propagation and spread control
Named thornless cultivars are commonly propagated by grafting or budding to preserve form and thornfree characteristics. The species can produce root suckers in some stock plants so remove suckers at the soil line to prevent unwanted thicketing and monitor for new shoots from the root zone.
Frequently asked questions
- How fast does Thornless Honeylocust grow?
- Growth rate varies with cultivar and site. Many landscape sources describe it as establishing and increasing in size relatively quickly in good sun and soil, but exact rates depend on conditions and nursery stock.
- Is Thornless Honeylocust suitable for street planting?
- Yes. It is commonly used as a street and shade tree because it tolerates urban soils and poor site conditions while providing a light canopy.
- What soil does it prefer?
- It prefers well drained soils and tolerates clay and alkaline types. Avoid sites that remain waterlogged.
- Is it safe for pets and people?
- Toxicity for pods and seeds is not clearly documented for this variety. Check with local poison control or the ASPCA before advising on ingestion by people or pets.
- Can I grow Thornless Honeylocust in a container?
- Its typical mature size of 30 to 70 feet makes it unsuitable for long term container culture. Use it in open landscape sites with room for a large root system.
- How do I control suckers?
- Remove root suckers at the soil line and monitor the root zone. For grafted cultivars avoid cutting below the graft to prevent rootstock suckers from emerging.
Related Plants
