Repotting Sick and Weak Phalaenopsis Orchids Requires Care: Save the Seedlings in These 5 Steps
When a Phalaenopsis orchid's leaves turn yellow and go limp, and its roots are either half rotted or shriveled and lifeless, repotting is the"key to saving its life." But many people panic and act rashly: they just rip off the old medium, casually trim the roots, and switch to a bigger pot, only to find the orchid gets weaker with each change until it dies. In fact, repotting sick and weak orchids requires "a gentle touch and good technique." Follow these 5 steps to help it recover and slowly regain its strength.
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Next, clean off the old medium gently, and don't damage the few good roots that remain. After taking it out, don't rub the medium off with your hands, especially sphagnum moss. If thin, weak new roots are wrapped inside, rubbing will break them. You can use a toothpick to gently pick the sphagnum moss apart, or hold it under a faucet and rinse it slowly with a gentle stream of water (not too cold, about room temperature), rinsing the old medium clean. This way you can clearly see which roots are good and which are bad. Remember, when rinsing, don't blast the roots directly. Rinse gently along the direction of the roots to avoid injuring the healthy ones.
Third, trimming the roots and disinfecting is the core step. Don't keep the bad roots, but don't cut the good ones carelessly. This step is the most critical. Cut it wrong and there's no saving it! First, find a sterilized pair of scissors (wipe them with alcohol), then pick out the bad roots: rotted roots (blackish brown, mushy, oozing water when squeezed), hollow roots (shriveled, with only a layer of skin left), and blackened old roots. These must be completely cut off. When cutting, cut close to the base of the healthy root, and don't leave stubs, or they'll easily get moldy. But note: even if only a few thin white roots or new roots with crystal tips remain, you must keep them. These are the "life-saving roots." If you cut them all off, the orchid truly can't be saved. After trimming, soak the root system in a carbendazim solution for 15 minutes (don't make the concentration too high; dilute according to the instructions). After soaking, take it out and let it dry in a ventilated, shady place. Be sure to let it dry until the cut ends turn dry and white, otherwise, if you pot it while still damp, the roots will surely rot.
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15-25°C is best), and let it rest for 3-5 days. Once the roots have adapted to the new medium, water it thoroughly once slowly with a gentle stream of water. After that, just keep the medium slightly moist. Don't water too much.
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