It's the reflection of the yellow color. In any bright light the yellow will reflect, therefore, most people like butter. We did it with dandelions when I was a kid, too. Don't know that anyone ever failed to like butter.
We used to do the buttercup thing when I was a child in niagara falls, NY. And my screen name is because my favorite color is yellow. Of course I like butter.
Name: Rick Corey Everett WA 98204 (Zone 8a) Sunset Zone 5. Koppen Csb. Eco 2f
Mary said:
>> Rick, you have one heck of a lot of energy. Whaling on phone books with a mattock?
Upper-body work, I can do. It's my legs and ankles that are weakest. And forget about kneeling and stooping!
Even when I was excavating my raised beds and making the soil for them, I had to stop and sit often even though 90% of the work was arms-shoulder-back. I used a pick and mattock to remove clay and rocks from juniper roots. Then shoveling and wheel-barrowing to remove the clay and rocks to where I could screen out rocks and add amendments. That took raking, hoeing and shoveling.
Then I would back-fill Bed #2 with the soil I made from the clay that I had dug out of Bed #1.
All that except the wheel-barrowing was upper-body work. Despite that, I was limited by how long I could stand. So I set up a chair right next to my work space, and sometimes I could shovel or hoe from a sitting position.
I think I must have some mole ancestry. I just love digging and improving soil.