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From: Wellman, IA
Region: Midwest
Topic: Edible Plants, Trees
Title: Sap of mulberry similar to sap of maple for syrup from Wellman IA
Answered by: Barbara Medford
The only reference to mulberry tree syrup we could find was this on Morus rubra (red mulberry), which had instructions for extracting and cooking with, as well as medicinal use for, juice from the berries.
This USDA Plant Profile page on Morus rubra (Red mulberry) shows that, while the tree grows natively in Iowa, it does not necessarily grow in Washington Co., in the southeast corner of the state. That doesn't mean it won't grow there, it just means they have no record of it growing there.
On our own webpage on Morus rubra (Red mulberry), we found the only other mention of the sap:
"Warning: Unripe fruit and milky sap from all parts have low toxicity if eaten. Symptoms include hallucinations and stomach upset. Toxic Principle: Unidentified."
So, we wouldn't suggest experimenting.
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