Mortar for retaining wall

[sWozzie]

I am building a retaining wall and was wondering if there are any special requirements for the mortar. Presumably it would have to be stronger than normal mortar and have more mositure resistant attributes?

[thedoctor]

When there is a chance of sulphate attack its a good idea to use a sulphate resisting cement. Using sulphate resisting mortar below ground a mix of 3 to 1 is recommended. This strong mix reduces flexibility so where possible a thicker wall of two skins tied together would serve best.