Answer: Purple Leaf Sand cherry (cistena) is reported to have a fast growth rate - typically 12-24" per year. Of course growth rate depends upon the growing environment and the care your plants will be getting, and.... it will take a full growing season for your new plants to become established in their new homes. So I wouldn't expect exceptional growth by August, but by next summer they will be almost double in size.
Best wishes with your new plants.
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