Concrete blocks, 2 types?

[AdamAshworth1]

I am looking at buying my 9 inch hollow concrete blocks for my raised flower bed wall. I have been to 2 places- one sell grey blocks the other are yellow. Both of which are 7 newtons. Does it make a difference? I take it you can render both of them?

 

[pred]

Will the hollow blocks not be a breeding ground for slugs and snails??

Can you not make a feature of the yellow blocks and make a good job of the beds and perps useing a bucket handle??

 

[AdamAshworth1]

Blocks will be capped. Didn't understand the rest?

 

[pred]

Do you have to render the wall? Could you not have "face blockwork" as appossed to "face brickwork"??