How to distinguish true from false before introducing fragrant flower locust?

Nursery stock identification methods Currently the fake and inferior fragrant flower locust nursery stock sold on the market generally falls into the following four types: (1) Red flower black locust substituted for fragrant flower locust. The red flower black locust and the fragrant flower locust both have papilionaceous purplish-red corollas; the red flower black locust blooms once a year, bears pods, and is grafted using black locust as rootstock. The fragrant flower locust blooms twice a year, does not bear pods, and is propagated from root segments. (2) Aged root stock. Perennial fragrant flower locust root stock, due to aging, has an extremely low germination rate. According to trial plantings, fragrant flower locust root stock over two years old is not suitable for use as planting material, and even less should it be sold on the market, so as to avoid causing huge losses to customers. (3) Grafted fragrant flower locust seedlings. Grafted seedlings made by using fragrant flower locust branches with black locust seedlings as rootstock can be used directly for engineering greening, but cannot be used for propagation. The nursery stock propagated from the root stock of such seedlings will all be black locust seedlings. (4) Adulteration with black locust or false indigo bush seedlings. Black locust seedlings have large, hard thorns; false indigo bush has no thorns, while the fragrant flower locust has a small number of small thorns. Root stock identification methods Currently most fragrant flower locust root stock is adulterated with black locust and false indigo bush root stock. Fragrant flower locust root stock is slightly softer than black locust root stock, with a yellowish skin color and fewer root nodules than black locust; false indigo bush root epidermis is smoother than that of fragrant flower locust, but thinner roots are difficult to distinguish.