Growing on a slope advice please

Haven't been around for ages mainly because my garden is such a mess that I cannot grow anything (doing a great job with weeds though). But we are hoping to sort it out this year and need advice

Our garden is on a slope not a horrendous rope needed slope but a slope nontheless. I had been planning on putting in raised beds so that I have a level growing space. The plan was one 6" board at the top and three at the bottom and then fill with soil (yes I know it will need a lot and be expensive). Then two weeks ago I was sorting out the front garden (flat) and all of the pinks from last year were growing happily again, yet in the back where I already have two raised beds (no where near as deep as these others will be) the pinks had not survived.

This got me thinking, my onions will not grow in these raised beds and the only time I grew potatoes in them they had the worst scab ever. Now I am wondering if the raised beds are an issue for some plants. I want to grow spuds, onions, cabbage, brussels sprouts as well as salad stuff and beans and all sorts of things.

So now I am thinking should we just make an edging (but what with?) around each "bed" to stop the soil moving and just grow on a slope? Origininal plan was for gravel paths in between the beds which I could still do if I edge them, don't just want mud or grass between them

What would you do?

Hi purplebean. Good to "see" you again 

I am not sure why plants would not survive in raised beds. I grow like this at the plot and everything is fine.

Do you have very shallow top soil and so in creating level beds you have inadvertently planted at the top end in subsoil? Just a thought.

Thanks for the advice. Not sure of the problem with the raised beds but the top couple of inches dries out almost instantly which I am guessing is something to do with it. Hubby has now decided he wants to terrace the garden and is working out the best way to do it. Will let you know what we finally decide