Last spring, I got this brilliant idea to curve the landscape I'm on, it was way too flattened for my taste, and as such I hurriedly dug a hole about a metre and a half deep at it's deepest point. Out of a mixture of stubbornness and curiosity, I decided that I didn't want to export anything I dug up, therefore soil that was dug up was laid around the hole, and in nearby places to form curves and small hills, with small swales having already been installed at the bottom some of the places, though not inside the hole.
The thing is, I was highly optimistic and a bit lazy when it came to the later stages of this. I put in some stone tiles alongside the walls, yet it isn't a sustainable solution at all. You can see the actual stones I refer to in the photos listed.
The grand issue is still the walls, how do I secure their position, in order to make sure they do not erode away?
I've been thinking about big stones with clay mortar, but I think it will probably end up badly as I live in Denmark where rain is quite a common occurrence.
Another thing I've done is planted different plants with different roots alongside the walls, taproots and spreading roots in an attempt to create a naturally strong and sturdy wall as time progresses, however I didn't have enough perennial plants at my disposal through the summer for the whole thing, which is why you see a lot of White Mustard as a temporary cover.
The soil that was dug up was primarily sandy, and it is sitting on top of a huge pile of chalk.
Therefore, dear friends, what would you do in my position?
A thing I have to point out though, is that I'd very much like to refrain from using cement.
EDIT: I'm having a bit of trouble with the photos, they don't really want to be shown here despite the "[ img ]" command. Therefore,
Here's a direct link to all three
