Can crape myrtle trees survive near black walnut trees?
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I have checked several sources and have found conflicting information on the effect of juglone on crape myrtle. Juglone is the toxic substance released from all parts of the black walnut tree. Many plants are inhibited by this substance. Some sources say the crape myrtle is tolerant; others suggest that it is not. Crape myrtle does require full sun so it should not be planted where it will be shaded by the black walnut or any other tree or structure.
You asked if crape myrtle can survive near a black walnut tree. Based on what I read, I would not recommend planting it near a black walnut. It may survive, but if you want the best growth and flowering from your crape myrtle, you should consider planting it elsewhere.