Locking concrete blocks
I recommend using interlocking concrete landscaping blocks to build garden beds.
No mortar - rearrange them as you change your mind.
Build up to a metre high. Just lay on a good bed of levelled gravel - still no mortar.

Build to any radius
Pretty good results are possible for a non-professional.
Learnings
- getting the initial base level is the key to success
- make sure you have sufficient dug-out clearance behind them to allow for the batter (slope) as they rise in levels
- whack the artifical lookinmg bits off the supposedly rough corners before you stack them
- cut them with an angle grinder or masonry saw - very hard to scribe and split them cleanly like a paver or brick
- don't forget to put conduit for water and electrical in
- order more








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