How would you install 12" Wide Corten Steel edging for a planter?
If you are building soil up behind the steel, you need stakes. You also need to know the recommended spacing to support the weight of the soil. Cor ten can look really good, but not always. I'd take a good, hard look at how it is going to look against your fake grass, because if the tones are wrong, what you will see is an orange ---- probably ...