Potting soils may look like garden dirt, but they are "soilless mixes", made with peat, vermiculite and perlite. Because these materials are acidic, potting soils also contain a very fine powdered dolomite lime to balance the PH of the mix. Since nursery pots restrict air and water movement, potting soils are a "chunky" texture to keep roots healthy.
These soilless mixes contain no fertilizer - you use hydroponic foods (dissolved in water) to supply plants with all the nutrients they need.
Here are some guidelines for gardening with potting soils:
2) Use hydroponic nutrients designed for soilless mixes.
3) Use the right size nursery pot
4) Feeding and watering
Why you should alternate watering and feeding:
When you feed your plants, some of the fertilizer is "sucked up" by the potting mix. If you fertilized every time, the nutrients would build up in the potting soil and damage your plant's roots. When you give your plants plain water between feedings, it re-dissolves the fertilizer in the potting soil, making it available to the roots and helping to avoid fertilizer build-up. Using the "feed-water-feed-water" method keeps roots healthy and satisfied while the top growth gets all the minerals it needs. Other hints":
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