Staff Answer
Nov 15, 2021 - 09:14 AM
These should stay white.
The white top dressings that turn yellow are typically pearlite or pumice stone, really anything that's porous. The reason they turn yellow is because most soils have tannins in them. These tannins are naturally occurring in bark and other bits of plant matter that end up in organic soils.
When you water your plants, these tannins are dissolved, giving the water a brownish look. Normally, they then flow with the water out of the pot's drainage holes and don't stain anything, but if you have a white, porous dressing, then the dressing itself will suck up some of the water, with the tannins, into themselves. After the water evaporates, the tannins are left behind and stain your white dressing. These deco pebbles are smooth so there are no pores for tannin rich water to enter through.
The white top dressings that turn yellow are typically pearlite or pumice stone, really anything that's porous. The reason they turn yellow is because most soils have tannins in them. These tannins are naturally occurring in bark and other bits of plant matter that end up in organic soils.
When you water your plants, these tannins are dissolved, giving the water a brownish look. Normally, they then flow with the water out of the pot's drainage holes and don't stain anything, but if you have a white, porous dressing, then the dressing itself will suck up some of the water, with the tannins, into themselves. After the water evaporates, the tannins are left behind and stain your white dressing. These deco pebbles are smooth so there are no pores for tannin rich water to enter through.
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