I am building a garden wall 9inch flemish bond in class b engineering bricks. It will be 1.2m high 3m long,steps and then another 3m. I will be laying a patio but in the corners i will be having a flower bed to help with drainage from patio(garden steep slope).The rest of the water will flow down the steps. The wall will be retaining the soil in the corners and the patio elsewhere.It will be retaining 500mm of soil in the corners. Garden drains quite well. Would i need weep holes for this small amount. I dont really want to put them in but dont know if it will undermine the wall when the soil is wet.The soil area will only be 1m square in each corner. An help would be appreciated.