Brick planters...advice required

[Lamboluke]

Hello. I'm a bit of a DIY novice but I'm wanting to build some brick planters at the end of the garden. The only issue is the garden slopes down towards the house and isn't level.
The surface I'm wanting to brick ontop of its grass/soil so what would be best to do in order to level it off?
The slope isn't severe but I don't know what would be best to do?
Do you need a hard solid foundation to lay the bricks onto?
Have some pebbles and then paving slabs placed ontop as a level base and then the bricks?

Thanks.
Photo for reference. Just seeded it recently as a temporary measure before a patio goes in. Was previously decked.


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[r896neo]

bricks even a couple high need a soild concrete foundation. You can simply dig the foundatin level and then have a few bricks partially buried by the slope.

 

[Lamboluke]

So did a big of a trench which is level and then lay some concrete to form a base?

 

[r896neo]

yes, just pretend the slope isn't there and dig a level trench and pour concrete at least 4 inches thick. if they are going to be any higher than 4 courses high make it about 5''

 

[Lamboluke]

Great stuff, thanks!