BushDoctor
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on July 1, 2020
It does look like mechanical damage, and nothing serious to worry about.
Here are some articles to help you care for them:
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/how-to-care-for-hibiscus-plants.htm
https://www.gardeningknowhow.com/ornamental/flowers/begonia/annual-begonia-care.htm
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