I question the need for them. There have been two rationales put forward: one to protect the heads from the heavy mowers used by commercial services, and two, to keep the heads free to pop up through the grass.
The mowers used here are the same as used up north, yet no one up north ever has the donuts to protect the heads. Secondly, if you are doing the grass cutting yourself, you will be using a small power mower, not the huge ones.
As far as keeping the heads free to pop up, my lawn is 2 years old and does not have donuts, yet all the heads continue to function just fine.
I know it seems to be the norm down here to have them, but so far they seem to be an unsightly, somewhat expensive, waste of time. Perhaps my tune will change in the future.
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