"The hack Old soil isn't always bad soil. Most potting mixes lose structure and nutrition over time, but they can often be revived with a bit of care. If the mix smells musty, contains mould or has signs of fungus gnats, it's best to discard it. But if it's dry, healthy and crumbly, you can usually bring it back to life. The method Tip the used soil into a clean container, break up any clumps, and remove old roots or debris."
"To refresh it, mix in around one-third new compost, plus a handful of perlite or coco coir, to increase aeration and drainage. For large tropical plants, add a slow-release fertiliser. If you're unsure about pests, moisten the soil, place it on a tray, cover with foil, and bake it in an oven at 82-93C (180-200F) for 30 minutes to sterilise it."
Repotting produces used potting mix that can be revived or should be discarded depending on condition. Discard mixes that smell musty, contain mould, or show signs of fungus gnats. Dry, healthy, crumbly mix can be refreshed by breaking up clumps and removing old roots and debris. Mix roughly one-third new compost and a handful of perlite or coco coir to improve aeration and drainage. Add slow-release fertilizer for large tropical plants. To eliminate pests, moisten soil, place on a tray, cover with foil, and bake at 82–93°C (180–200°F) for 30 minutes. Refresh when possible; replace if necessary.
Read at www.theguardian.com
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