Can coal slag be directly mixed with soil to grow flowers (how to mix burnt honeycomb coal slag with soil to grow flowers)

Can burnt coal slag be directly mixed with soil to grow flowers?

Honeycomb coal slag can be used to grow flowers, such as orchids. However, coal slag cannot be used directly to mix soil. If it is used directly to grow flowers, the harmful substances it contains will harm the growth of flowers.

Because coal slag does contain alkaline substances , and those very fine powders are not conducive to the growth of plants. Before using coal slag to grow flowers, you must first process it and then mix it into the potting soil, and it will be very useful.

After treatment, adding some of it when preparing flower soil can increase the permeability of the potting soil and reduce the root rot and yellowing leaves caused by excessive watering when growing flowers.

How to deal with coal slag before mixing it with flower soil

① Screening of coal slag particles

Before using coal slag to grow flowers, the honeycomb coal should be crushed , and the coal slag should be directly placed into a fine-mesh sieve to sift out some fine powder.

After screening, pick out the small black coal pieces that have not been burned through, and only keep those coal slag particles with uniform coarseness and fineness. Such coal slag is water-absorbent and breathable, and is best for growing flowers.

② Rinse with clean water

After screening out the coal slag particles, pour them into clean water, rub and rinse them repeatedly to clean all the dust on them. When the rinse water becomes clear, take it out and dry it, and then use it to prepare flower soil.

③ Sterilization

After that, put it in the sun for drying , and finally mix it with soil for growing flowers. It should be noted that no matter what kind of soil is used for growing flowers, it must be sterilized in advance to avoid residual germs.

How to use coal slag to grow flowers

①Prepare the culture soil

When growing flowers with coal slag, it can only be used in combination with other soils . After all, the nutrients are relatively scarce, and it can only be used to improve the permeability of the potting soil.

You can directly put a layer at the bottom of the pot, or you can add 20% to 30% of coal slag when preparing flower soil and mix it evenly to increase the soil's permeability.

②Used to grow succulents

Succulent plants need to be grown with materials that are very permeable and breathable. The most commonly used ones are vermiculite, perlite, peat soil, etc.

In fact, coal slag is also a good material for growing succulents. It can be combined with some other soils to grow succulents .

③ Use the bottom of the flower pot to grow orchids

Originally, red clay is not suitable for growing plants, let alone orchids. However, coal slag is different from ordinary red clay. After being calcined, its chemical and physical properties have changed.

The coal slag should be screened into small and medium-sized particles, and then washed with alkali and mixed with pine needle soil . Or the coal slag and bark should be mixed evenly, and it is best to add some moss . Coal slag has a strong fire property and is easy to damage the roots when first planted.