The idea of adding Styrofoam (polystyrene) to the bottom of plant pots was a widespread gardening myth intended to improve drainage while reducing the amount of soil needed. However, this practice is now recognized as harmful for several reasons:
- Drainage Misconception: Contrary to popular belief, adding materials like Styrofoam, gravel, or rocks to the bottom of a pot does not improve drainage. It creates a “perched water table,” which means water tends to accumulate above the added layer rather than draining through it. This can lead to waterlogged roots and root rot.
- Environmental Concerns: Styrofoam is not biodegradable and can break down into microplastics, which harm ecosystems. Disposing of Styrofoam improperly can exacerbate environmental pollution.
- Health of the Plants: Plants require a consistent soil profile for proper root development. Adding Styrofoam disrupts this and may limit root growth, ultimately harming the plant.
Other Common Mistakes When Planting Perennials in Pots:
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