I need to rebuild a brick planter outside my home, since over time it has
deteriorated to eyesore level. I think I can rebuild it myself, however I
need to understand which mortar or concrete I should use.

Home Depot sells something called "Mortar Mix" that you just mix with water
- it says on the package "intended for masonry projects." But someone told
me that it's better to mix up some concrete and add sand to it for better
performance. Can anyone shed some light onto this for me?

Thanks!

Jeb