Straight potting soil is not enough for your plants, and over time, it can dry out and repel water. A mix of potting soil, compost, and sand is best.
Here's Why Take Precautions Before Using Potting Soil In A Raised Garden Bed

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Straight potting soil is not enough for your plants, and over time, it can dry out and repel water. A mix of potting soil, compost, and sand is best.