Earthen Wall Repair?

A reader wrote in:

Hi Kevin. I am looking for some advice on repairing our exterior earthenwalls on our strawbale house. Last summer a hale storm pocked the south wall and we need to rapair. The walls have a lime wash as sealer. I'm thinking the recipe should be sand, prickly pear cactus juice, clay,manure, like our original recipe. I'm hoping the mud repair will stick tothe lime and I'm thinking we have to feather the pock marks out in all directions. Anyway, do you have any advice?

Thanks, Jessica