Black locust and Manna ash are often considered for the same spot in the garden (shade, flowers, pollinator friendly, specimen). The data below shows where they differ: size, hardiness, care, toxicity and price.
Robinia pseudoacacia 8 m × 5 m after 10 years
A fast-growing, drought-tolerant tree from North America with an open crown, pinnate leaves and fragrant white flower clusters in late May. It is sold…
Fraxinus ornus 5 m × 3.5 m after 10 years
Manna ash is a medium-sized tree with a rounded crown that covers itself in creamy white, scented flower plumes around May and turns yellow to…
Black locust: We do not recommend it for most Central European gardens.
Black locust is hardier: down to -40 °C, against -23 °C for Manna ash.
Manna ash needs less care than Black locust.
Black locust is cheaper: about €50 at the size usually planted, against about €81 for Manna ash.
|
Feature
|
Black locust
|
Manna ash
|
|---|---|---|
| Group | Large tree | Large tree |
| Size after 10 years | 8 m × 5 m | 5 m × 3.5 m |
| Ultimate size | 6–25 m × 4–18 m | 8–15 m × 6–12 m |
| Growth rate | Fast | Medium |
| Light | Full sun | Full sun |
| Soil | Average garden soil, Sandy, Clay, Calcareous | Average garden soil, Clay, Sandy, Calcareous |
| Hardiness | down to -40 °C (USDA 3, RHS H7) | down to -23 °C (USDA 6, RHS H7) |
| Foliage | Deciduous | Deciduous |
| Flowering | May–June, white | April–June, white |
| Water need | Low | Low |
| Drought tolerance | High | High |
| Maintenance | Medium | Low |
| Planting distance | 800 cm | 600 cm |
| For dogs | Toxic | no data |
| For cats | Toxic | no data |
| For children | Toxic | Non-toxic (uncertain) |
| Typical price | approx. €50 | approx. €81 |
Prices are rounded, indicative values. Toxicity data is for information only. If your pet or child has eaten a plant, contact a vet or a doctor. Data updated: October 13, 2026
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