What fertilizer should be given to weak Phalaenopsis seedlings, and can rooting liquid be used?

Those who grow Phalaenopsis have surely encountered this situation: their orchid seedlings look wilted, the leaves have no luster, and new roots are reluctant to grow. At this point they start to worry - how should weak seedlings be fertilized? Can rooting liquid be used?

Weak seedlings are like people with weak constitutions; they cannot withstand heavy tonics. If you use concentrated fertilizer right away, it is very easy to burn the roots, and instead the seedlings end up in even worse shape. So what kind of fertilizer is suitable? Remember one principle: light, mild, and complete in nutrients.

What is used most often for weak seedlings is diluted orchid-specific fertilizer, the kind with a balanced nitrogen-phosphorus-potassium ratio, such as 1:1:1. When using it, the concentration must be halved again compared with the instructions. For example, if the instructions say to add 1 milliliter to 1 liter of water, then add 0.5 milliliter. Better too dilute than too concentrated. The frequency should not be too high either. In spring and autumn, once every half month is enough. In winter, when the temperature is low, stop. In summer, when it is hot, also feed less, otherwise the root system cannot take it.

Some people also like to use organic fertilizer, such as well-fermented sheep manure water or rice-washing water. This stuff is mild, yes, but it must be thoroughly fermented! Organic fertilizer that is not fully fermented will undergo "secondary fermentation" in the pot, and the heat produced can burn the roots. Even if it is well fermented, it still has to be diluted twenty to thirty times before use, otherwise that smell not only attracts insects, but is also too strong for weak seedlings.

Now let's talk about rooting liquid. Many people think that weak seedlings have poor roots, and using rooting liquid can stimulate new roots. This idea is not wrong, but it must be used according to the situation. If this weak seedling only has slightly soft leaves, the roots are not rotten, and it is just growing slowly, then diluted rooting liquid can indeed help. For example, mix with water at a ratio of 1:1000, spray a little around the roots, or briefly soak the roots for 10 minutes, once every half month. This can stimulate new roots to emerge.

But if the roots have already rotted a lot, are black and have no vitality, then do not rush to use rooting liquid. First cut off the rotten roots, soak them in some carbendazim to disinfect, let them dry, then repot them in clean growing medium. Wait one or two weeks for it to recover, and once you are sure there is no more root rot, then using rooting liquid will be effective. Otherwise, if the rotten roots are still there and you only stimulate new roots, the old problem is not solved, and the new roots will not grow either.

There is also a small detail: when fertilizing weak seedlings and using rooting liquid, both should be done in good weather, for example in the morning when the temperature is 15-25°C. At this time the orchid seedlings have high activity and absorb well. If it is rainy or the temperature is too low or too high, even if you feed fertilizer and use rooting liquid, it cannot "eat" it, and instead it becomes a burden.

In the end, the key to caring for weak seedlings is not to rely on fertilizer and medicine to "force" them, but first to stabilize their condition. Keep the growing medium breathable and the environment ventilated, and do not fuss over repotting them. Wait for the root system to gradually recover, then supplement nutrients step by step. This is more effective than anything.