Renewable Natural Backwalls Suggestion

[Dugley]

Plants like starnacles can be planted by pips on natural backwalls, which is important to know and unintuitive.

There is currently no way to create natural backwalls as far as I can tell. It would be nice to be able to make them for backwall dependent plants and features.

My best thoughts on how to make this possible is to allow cooking drywall or tempshift plates into backwall for solid-solid conversions. There aren't many recipes that would allow for this, but there are some. Clay->ceramic, peat->coal, and coal->refined carbon all come to mind.

[ghkbrew]

I'd I also like to have a way to create "natural" backwalls.  However, cooking tempshift plates into solid tiles is already a common technique.  (It's handy for capping unwanted volcano, for example).  Changing that to creating natural backwalls, would be disruptive.  Maybe just melted dryway makes backwalls?

Alternatively, backwalls could just always be formed as part of solid tile formation?  A portion of a solidifying solid (say, 10%) could form a backwall whenever a natural tile would be created.  Then you can dig out the solid tile if you want the backwall.