Ballasted

“Its Hywind turbine, mounted on a ballasted vertical steel cylinder that floats upright and is anchored to the seabed, has a unique navigation system developed by Statoil to keep it in the position.” (http://uk.reuters.com/article/2015/07/07/us-statoil-windpower-floating-idUKKCN0PH1ST20150707)

That would be the anchor.

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Seawind

“Several [US] state governments are forging ahead with their own ambitions for offshore wind farms, and commercial developers say that they could start planting turbines in the ocean as early as next year. … But before the field can take off, proponents will have to prove that offshore wind can compete financially against other energy sources, and can clear the thicket of state and federal regulations that govern projects in coastal waters.” (http://www.nature.com/news/renewable-energy-wind-power-tests-the-waters-1.15992)

As offshore wind power becomes an exploitable resource, these crop allusions will need a turbine harvester.