https://www.google.com/search?q=plot+of+sycamore+pollen+over+the+year+in+the+northeast&sca_esv=08beef924166d4a9&sxsrf=APpeQnsgz8NBUWueCOttJiSVMESTzhOQeQ%3A1782097704613&ei=KKc4apaJJa6Fw8cP8cmlyAk&ved=0ahUKEwiWvY2l75mVAxWuwvACHfFkCZkQ4dUDCBI&uact=5&oq=plot+of+sycamore+pollen+over+the+year+in+the+northeast&gs_lp=Egxnd3Mtd2l6LXNlcnAiNnBsb3Qgb2Ygc3ljYW1vcmUgcG9sbGVuIG92ZXIgdGhlIHllYXIgaW4gdGhlIG5vcnRoZWFzdDIIECEYoAEYwwRIqC1Q4QlY9SpwBHgAkAEAmAFfoAH8BqoBAjExuAEDyAEA-AEBmAIMoALoBcICChAAGEcY1gQYsAPCAgoQIRgKGKABGMMEmAMAiAYBkAYIkgcEMTEuMaAH1j6yBwM3LjG4B9MFwgcGMC4xMC4yyAcdgAgB&sclient=gws-wiz-serp QT{{” In the Northeast, sycamore pollen follows a bell-shaped curve that peaks sharply in mid-spring. The season typically begins in early April, peaks heavily between mid-April and mid-May, and subsides completely by late May. Sycamore trees produce pollen before and during the emergence of their leaves. [1, 2, 3]
Seasonal Timeline
January – March: Bare, dormant. Pollen levels remain at zero. Early April: The season opens. Mild to moderate pollen release as catkins and flowers open.
Mid-April to Early May: Peak Season. Pollen counts spike to “High” levels, often coinciding with oak, birch, and ash pollens.
Late May: The pollination cycle concludes. The sycamore tree becomes lush with leaves, and local pollen levels drop to zero. [1, 2, 3, 4, 5]
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Similar behavior for birch
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