A mulching cover (100) for a planter (200) is formed from an iris-type diaphragm (120) that is circumscribed by a coaxial collar (160) for mounting the diaphragm (120) to the planter (200). The diaphragm (120) defines a central hole through which a plant stem (310) may pass. The diaphragm (120) and the coaxial collar (160) together define a substantially radial breach (134a) which permits the collar (160) and the diaphragm (120) to be opened and closed. The plant stem (310) is inserted through the breach (134a) in the open collar (160) and fed into the central hole. The cover (100) is rolled tighter until it is of the same radius as the planter (200) and is then inserted into and secured to the planter (200).
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