Can the old soil used for flower cultivation still be used? "Can the old soil used for flower cultivation be reused?"

Can old soil used for gardening still be used?For most women, the experience of common knowledge about gardening, can old soil used for gardening still be used? Let's find out together.Recently, some gardening enthusiasts have asked whether old soil used for gardening can still be used, and the answer is yes. While it can be used, there are some details that need our attention. For instance, old soil used for gardening may have exhausted its nutrients, and using it directly to grow new plants may lead to slow growth. Moreover, the old soil may contain some eggs and germs, which can also affect new plants.In simple terms, old soil can be used, but it's best not to use it directly without proper treatment. Let's take a look at an original article by Photosynthesis (WeChat ID) on how to treat old soil.Soil from potted plants that have previously had plants grown in them will contain residual roots, germs, and eggs from the last plant. Over time, the nutrients in the original soil are washed away by watering. The most critical drawback is the pulverization of particles in the medium, which affects aeration and drainage, leading to new plant roots being unable to extend or rotting and dying.1. Find a warm, windless day to turn the potting soil out and remove visible residual roots and dead leaves.2. Spread the old soil evenly on newspapers (or other platforms) to dry, making sure to use several layers of newspaper since one can easily tear. The old soil should be spread evenly, and it will dry in two days without wind or rain (if conditions allow, drying for several more days can enhance the disinfecting effect).3. After drying, mix the old soil with new leaf mold soil, any fine颗粒-sized medium you have on hand, and slow-release fertilizer and insecticide (optional). The approximate ratio is 2 parts old soil, 1 part leaf mold soil, and 1 part fine颗粒-sized soil, and it's ready to use.Note: Steps 2 and 3 can be reversed. You can mix them first and then put them in a plastic bag, followed by exposing them to the sun for a few days to kill insects and germs.Finally, the standard for improved soil is that it should form a ball when squeezed and crumble easily when poked with a finger.Editor's note: Since gardening enthusiasts have different conditions with their old soil, some use peat, some use garden soil, some use mixed media, some grow flowers that are not prone to pests, and some grow flowers that are easily infested, among other situations. Therefore, enthusiasts should adjust whether to use the old soil based on their specific conditions. For example, if someone grows roses and the roses get root nodules, then the old soil should be discarded because simply drying and applying some disinfectant cannot thoroughly remove the germs.So here is a suggestion for gardening enthusiasts: soil without germs can be reused, but soil with a history of difficult-to-remove germs should not be reused.The above sharing on whether old gardening soil can still be used is for reference and suggestion.