It's best not to eat Cassia. As an ornamental, it has no toxicity, but it itself is toxic. After eating, it will still have a certain impact on the body. Cassia seed, the fruit of Cassia with double pods, can be soaked in water, but it can't be drunk for a long time, otherwise it will also cause harm to the body. The reason why Cassia bipinnata can't be eaten is that Cassia bipinnata is a semi deciduous shrub, also known as Sophora japonica. It has certain toxicity, but if it is only used for viewing, it is not toxic and will not cause any impact on the body. Therefore, it is recommended not to eat it.
The fruit of double pod Cassia is the cassia seed we are very familiar with. It can make tea and drink. In addition, it has some other effects, but it can't be drunk in water for a long time, otherwise it will cause harm to human body.
And cassia seed can still be used as medicine and can be used to treat some physical diseases, but it's best not to use it at ordinary times.