My top 5 honey bee plants

North Seattle area, Washington, USA (Zone 8, elevation 70 ft).

Some links in the table may not work in the desktop version of Chrome browser (works in Safari).

Column 3: Blooming periods are based on observations during 2017 - 2022 (Zone 8, elevation 70 ft, North Seattle, Washington, USA). "All year" excludes periods with snow cover. Plants that bloom through fall - spring may lose flowers during cold weather. Plants with open-ended periods may lose flowers during summer drought or keep them until frost.

Columns 4,5: Pollen colors were captured from photos of pollen-carrying bees, using 'Digital Color Meter' app. Click HEX color codes to see reference photos. Photos in external links may be subject to copyright. When appropriate bee photos were not available, pollen chunks collected for microscopic analysis were photographed.

Column 6: Links to microscopic analysis. Related plants are grouped together.

Column 7: N (native), F (feral/neutralized), C (cultivated), noxA-C (class A-C noxious weed in 2021 Washington State Noxious Weed List).

Links

List of plants in Puget Sound lowlands (spreadsheet download, last update 12/8/22)
List of pollen sources, Wikipedia
Pollen wiki (German)
Plants that bees love, HoneyBeeSuite