A common issue that can arise with container gardening is the development of mold on or around the potting soil. Fortunately, most of these molds are harmless, and you may be surprised to know that molds and fungi are actually present in every organic gardening mix. However, just because they are (probably) harmless does not mean that we should ignore their presence completely. These saprophytic fungus may be a sign that your plants are not getting what they need in terms of sunlight, air circulation, and/or moisture. Since these molds and fungi may also be competing for nutrition with your plant, it is safer to pay a little attention to them.
A quick way to access the causes of the mold and fungus growth is to take a look at the location and environment where you're placing your planter:
Is your plant getting enough sunlight or always sitting in shade?
Mold and fungus love and thrive in cool, dark, and damp places. Allowing your planters to bask in the sunlight for several hours a day helps dry up the soil, preventing it from being constantly soaked in dampness.
Is the room too stuffy and humid?
Good ventilation and air circulation will also help get rid of unwanted moisture, lowering the chance of spore germination.
Is your soil too packed and damp?
If the soil is loose enough, there should be enough aeration to keep the soil from getting too wet.
With a sub-irritated planter like the Patch, it is still important to not over-water, and to allow all the water in the reservoir to be absorbed before filling it up again.