How to Mulch your Garden! 1. Prepare the area to be mulched. Before mulching, remove the weeds either manually or by using herbicide. To help prevent more weeds from re-emerging, put down a barrier like weedmat, but the barrier can be something as simple as newspaper or cardboard. 2. Select the mulch – it can be organic or inorganic 3. Apply the right amount of mulch. We recommend you apply mulch to a depth of 50-100mm depth to get the best weed suppression. But don’t pile mulch up against the stems of the plants. 4.Lastly, water it down