Answer: You can use cypress mulch over the root zone, it is a long lasting mulch material. However, if you are trying to protect grafted tea roses, a better approach would be to cover the base of each plant with a mound of soil about a foot tall and then cover that with mulch to stop it from eroding. This offers more insulation than mulch alone. Also, in the long run, it is better to use a mulch that will rot down and help feed the soil on an ongoing basis. Although it does require more frequent replenishment, it also enhances soil health and consequently that of the roses as well. But if cypress is what you have, go ahead and use it there or in a shrub border for instance.
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