Mold on potting soil is not uncommon. Yesterday the earth was still clean, today it is covered with light fluff - a rather unsightly appearance. The following article first deals with where the mold on potting soil comes from. In addition, the question of whether the mold is harmless or whether it represents a source of danger should be clarified. How can a hobby gardener effectively prevent the formation of mold? What to do if the mold has already spread and become a persistent plague?
Where does this mold come from?
This has probably already happened to every hobby gardener: only yesterday the flower pot was a feast for the eyes and today it is moldy on the surface. A field of fine gray-white fluff seems to have formed out of nowhere and is spreading. Mold is actually ubiquitous because its microscopic spores are found on the roots, in the substrate, i.e. in the potting soil itself, and even in the air. If the mold finds favorable conditions for its growth, it spreads quickly and can even become a nuisance.
Symptom of care failure
Favorable conditions for the outbreak of the mold plague are particularly prevalent if the plant is excessively watered. That can happen very quickly: forget
that yesterday was already poured and a portion of water quickly poured into the pot. It is not uncommon for people to try to water "in reserve" before the holiday, so that the houseplant literally floats in the water. Mold also thrives in sparingly heated rooms and with strong temperature fluctuations. Another reason for the spread of the mold is the too dense substrate. If the air circulation is severely restricted, the mold feels fine, but the growth does not.Mold as a source of danger?
Moldy earth looks rather unsavory, but the question arises as to whether mold is also dangerous or just a visual flaw. Unfortunately, it must be stated that mold infestation is by no means harmless. On the one hand, the infestation itself indicates that the plant is not being cared for correctly and is feeling uncomfortable. On the other hand, mold quickly becomes a dangerous and quite successful competitor of the plant "in the battle" for nutrients.
This means that the houseplant receives less and less food, but the mold continues to spread. What is more, mold infestation is also dangerous for humans. People with chronic or acute respiratory diseases are particularly at risk. If the immune system is affected by a previous illness or e.g. B. Chemotherapy is weakened, threatens, among other things, a so-called. Aspergillus pneumonia. Sinus infections, but also kidney or
Fight mold successfully
Once mold has spread to the surface of the potting soil, it is time to act. Preferably immediately, because unfortunately this plague does not go away by itself. The method is as radical as it is simple: repot in the new substrate.
Proceed as follows:
Prepare the work surface: In the garden, on the terrace or balcony, a protective film or Spread out newspaper, have a flower pot with the plant, a new pot, fresh substrate and a garden shovel ready,
Carefully pull the plant out of the pot, free the roots as completely as possible from the soil, if necessary also under a jet of water (use lukewarm water!),
Fill 1/4 to 1/3 of the pot volume with the fresh substrate, then plant the plant and carefully fill the pot with the potting soil. Leave a gap of 3-5 cm to the upper edge, never fill the pot to the brim!
Tip: The old pot can also be used again, if not too small. However, this must be thoroughly cleaned with hot water (of course without any cleaning agents).
The old substrate should preferably be disposed of, also on the compost heap or as residual waste.
Successfully preventing the infestation - four tips
Put together the potting soil yourself
The commercially available potting soil contains, among other things, a large proportion of peat, which forms a perfect breeding ground for mold culture. Plus, not every plant needs a lot of peat to feel comfortable. The mixture is best tailored to suit the plant.
Tip: Coconut humus is a recommended ingredient because it has fungicidal properties. Substrate with a high proportion of sand is also less prone to mold,
Loosen the substrate regularly.
As mentioned above, too dense a substrate favors the growth of mold, so it is worthwhile every now and then (e.g. B. once a week) to "dig up" the surface of the potting soil.
Tip: No expensive garden tools are required for this measure, a simple kitchen fork is usually sufficient. Especially practical with small pots!
Pour less.
It is often easier said than done, as water shortages are more of an unknown problem in Europe. But the generosity of the hobby gardener damages the plant enormously. It is often noticed too late that the plant is "drowning". When the roots die, it may be too late for any help. Therefore, preventing mold growth also means saving plants. Pouring through the coaster helps to keep the correct amount, but it is important that no "stagnant water" forms in the coaster. Water that the plant gets after approx. has not recorded an hour, belongs away. For people who travel often, it is advisable to purchase an irrigation system.
Select a suitable location.
Mold likes it moist, shady, but not necessarily warm. Most plants like it sunny to partial shade, are warmth-loving and can tolerate more drought than the mold would like. Therefore, if possible, choose a location that is optimal for the plant, but does not like the mold.
Frequently asked questions about mold growth
Does mold have to be repotted?
Repotting is the most promising. Reducing the amount of water and loosening the substrate can help. If the mold disappears after approx. a week, repotting is the order of the day.
Which home remedies prevent mold growth?
Grated activated charcoal tablet kills spores, cinnamon powder has the same effect. Put on the substrate, pour on, do not stir in. Tea tree oil can also act as a fungicide in low concentrations.
