Many of the houseplants they end up on windowsills at home, because it is often believed that direct sunlight can promote their growth and development.
However, this is often not the case, or rather it is not the case for all houseplants because many species prefer more sheltered and shaded areas.
Why avoid placing plants on the windowsill
Positioning on or near a windowsill may seem like a logical choice, but it often brings more problems than benefits for some plants. The main reasons are linked to their origins and the conditions that reproduce their natural habitat. Here are some of the main issues:
- Dry air and parasites
The air generated near a turned on radiator is extremely dry. This environment is not compatible with many tropical plants that require high humidity. Furthermore, too dry air favors the proliferation of parasites such as mites, which can attack leaves and stems, weakening the plant.
- Temperature changes
Windows and radiators create an unstable microclimate, with sudden changes in temperature. During the day, the plants may heat up excessively due to the radiator, while at night, with the drop in outside temperatures, they experience rapid cooling. This thermal stress can seriously damage them.
- Root warming
The heat coming from the radiator can reach the roots of the plants through the pot, altering their growth. Roots that are too hot stop functioning properly, causing water and nutrient absorption problems.
Among the winter plants not to be placed on the windowsill we find:
How to place on the windowsill safely
To position plants on the windowsill safely, even in the presence of radiators, it is important to adopt some strategies that help create an environment best suited to their needs. Increasing humidity is essential: placing a bowl of water over the heater or near the plants can encourage evaporation and improve the microclimate.
Irrigation must also be targeted, using lime-free water or rainwater to avoid heat-related problems, such as the formation of mold. Regular cleaning of the leaves, perhaps by misting them with water, helps maintain surface humidity and prevent infestations.
Furthermore, it is advisable to insulate the pots from direct heat with suitable supports or saucers with expanded clay, to protect the roots. Finally, it is important to frequently monitor the state of the plants: if you notice signs of yellowing or dryness, it is best to move them immediately to a more suitable environment.
If you have other tropical plants, consider moving them to the bathroom or kitchen during the winter – these rooms naturally have a higher humidity level, which is closer to their natural habitat.
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