Darwinian gardening again

The Darwinian Gardener is interviewed in the newsjournalonline. He explains how Darwinian gardening also applies to buried sprinkler systems, which is something that never occurred to me, I must admit. But I think he's running perilously close to self-contradiction even having sprinklers.

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Surely it's acceptable for a Darwinian to have fossil sprinklers buried in his garden. All he has to do to get them working is to replace the missing link.