Chokecherry is found in NewFoundland, Saskatchewan, down to North Carolina and as far  as Kansas. In Missouri it is more extensive in the northern part of the state North of the Missouri River on wooded slopes, bluffs and ravines. It can be grown in the southern part of the state and is not considered invasive or protected.

This is another plant that has little research to it and you may not really want to take time to invest in this one. 

The seeds of the chokecherry have high concentrations of hydrogen cyanide which is poison, but it is what gives almonds their distinctive flavor. In small amounts hydrogen cyanide is effective in improving respirations, digestion and can suppress the growth of cancer cells. It should be used with caution.