Item — HN Reader

I've heard that one of the challenges of maintaining fields of solar panels is keeping the vegetation around the panels under control. Solutions include using grazing animals such as sheep or even guinea pigs[0]. It sounds like this doesn't solve the management issue, but does claim "a field of wildflowers requires less mowing and pesticides than conventional grass does".

[0] https://digital.nepr.net/news/2016/04/01/the-solution-to-sol...

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The issue with grazing animals on the land is that it removes the benefit of allowing it to revert to nature - Flowers and brush depth that foster wildlife are stripped away by the grazing stock.

Just musing:

If you leave a patch of ground alone for an extended period of time, it'll transition through various phases of regrowth and eventually end up back at whatever the wild state of being for that region is. Often the end state is woodlands.

So since that conflicts with being a productive PV estate, at some point maintenance is inevitable or you'll end up losing the panels beneath a canopy. That said, the scale of that kind of regeneration might be a century while the useful lifetime of new PV installs is what... ~20-30 years?

So on that timescale what issues are you likely to hit allowing the land underneath PV installs to grow wild? Access would need to be maintained, panels would need to be lofted to a height that avoids any overgrowth, fire risks (electricity + dry brush etc) would need to be mitigated.

Main question I have though is sunlight coverage - Surely the panels and plant life are going to compete to some extent. What's stopping a PV deployment covering ~100% of the land area, shading it all out just like a forest canopy would?

One big issue with just letting the land go wild is invasive plants and shrubs taking over. Take a look at himalayan blackberries in the Pacific Northwest – they smother everything else out of existence.

A lot of restoration work is really just pausing the ecological succession at some beneficial stage. This is essentially what native Americans did; they 'gardened' the earth to support a diversity of plants and wildlife that was sustainable, and beneficial to people. [1][2]

In terms of incorporating solar panels into a more 'wild' habitat, Agroforestry offers a good model. There are a lot of shade tolerant shrubs, etc, that are grown under a canopy of taller trees. [3]

Silvopasture, which is a subset of agroforestry, uses grazing animals to obtain the best of both worlds – the animals play a part in sustaining a diverse ecosystem that's also beneficial to people. [4]

1: https://www.goodreads.com/book/show/39020.1491

2: https://www.goodreads.com/book/show/6411373-whole-earth-disc...

3: https://en.wikipedia.org/wiki/Agroforestry

4: https://en.wikipedia.org/wiki/Silvopasture

"benefit of allowing it to revert to nature"

Environmentalism is now best seen as planet scale gardening.