Help, please!

Posted by CjK on September 08, 2004

The gardener had been up since dawn, mowing the lawns and sweeping them, until the grass and **the dark flat rosettes** where the daisy plants had been seemed to shine.

What are *rosettes* in this sentence? Why they are in the lawns? And how they concern with the daisy plants?
Can anybody make the sentence esier? Thank you very much.