November 6, 2026, 7:30 am | Read time: 2 minutes
The internet is full of countless tips and tricks for houseplants. However, not all of them are as helpful as they initially sound. An unusual tip, for example, suggests putting aluminum foil in the flowerpot. But what is it supposed to achieve? myHOMEBOOK asked an expert.
The idea behind the aluminum foil trick in the flowerpot
Aluminum foil is said to regulate the temperature in the flowerpot. It is supposed to ensure that the substrate does not reach excessively high temperatures, which would cause moisture to evaporate more quickly. Additionally, aluminum foil is meant to reflect light. This has the advantage of preventing lower leaves from being shaded. Furthermore, aluminum foil in the flowerpot is supposed to act against pests by forming a kind of barrier.
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What an expert thinks of the trick
The expert views this trick critically. “The idea of using aluminum foil in flowerpots has no advantages from my perspective,” explains Sandra von Rekowski from the Federal Association of Allotment Gardeners in Germany. From an ecological standpoint, the disadvantages even outweigh the benefits, she explains. The soil climate would be disrupted, which could harm microorganisms. Additionally, aluminum foil in the flowerpot leads to insufficient ventilation, which could promote mold growth, for example.
Moreover, aluminum foil is environmentally harmful due to “energy-intensive production and poor recyclability,” von Rekowski explains.
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Everything works better without aluminum foil
You don’t need aluminum foil in the flowerpot. “More light reaches the plant by ensuring adequate plant spacing and, depending on the culture, thinning out–that means removing excess leaves,” says the expert. The temperature can also be better regulated without aluminum foil by using good soil and ensuring adequate ventilation.