Rainbow landscape, ll
No. Comfrey. * It’s well known in green-gardening circles as a good thing to grow** because it both cheers the soil up and makes terrific compost (it also makes a terrific tonic tisane for your plants if you can bear the smell of it steeping) but I’ve never seen it grown large scale like this, presumably for the same purpose.
* Or borage. See comments, if you’re feeling strong.
**Comfrey is also well known in herbalist and homeopathic circles as a wound-healer and bone-knitter.
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