What are the signs of underwatering in Phalaenopsis orchids? Is yellowing of the leaves a sign of underwatering?

Those of you who grow Phalaenopsis orchids have probably had this experience: staring at those few glossy green leaves, always wondering,"Is it thirsty?" "Does yellowing of the leaves mean I'm not giving it enough water?" In fact, this flower looks delicate, but the art of watering it is quite profound. Too little water really does cause a lot of trouble, but yellowing leaves are not necessarily a sign of underwatering.

What happens when a Phalaenopsis orchid gets too little water? The roots of this plant are aerial roots, plump and white, looking like succulents, but they are actually very afraid of drying out. If you forget to water it for several days, you will find that its fleshy roots begin to wrinkle, and the originally translucent white slowly turns grayish-brown, feeling hard to the touch with no elasticity at all. At this point the roots can no longer absorb water properly, and the leaves above will suffer along with them--first the oldest leaves at the bottom droop downward, with edges curling like waves, and the color changes from dark green to light green, feeling soft and limp, no longer as thick and glossy as usual.

In more severe cases, the whole plant will droop and look listless, the newly grown tender leaves will also turn yellow, and even the buds that have not yet had time to bloom will drop one by one, and the flowering season you have been looking forward to so much will be ruined just like that. If you still do not replenish water at this point, the leaves will begin to wither from the tips, gradually spreading to the entire leaf, and eventually the whole plant may die, which would be truly heartbreaking.

But then again, yellowing leaves are not caused only by underwatering. My neighbor made this mistake before: seeing the Phalaenopsis leaves turning yellow, they quickly watered heavily, but the yellowing got worse. Later they learned that Phalaenopsis roots are afraid of being stifled, and too much water causes root rot, which also makes the leaves turn yellow. Moreover, this kind of yellowing often starts from the middle leaves and comes with a slightly sticky feeling, completely different from the dry yellow of underwatering.

Too much light can also make the leaves turn yellow, especially in summer if you put the flower on a balcony in direct sunlight, yellow spots will appear on the leaves, looking as if they have been scorched by the sun. In addition, too much fertilizer burning the roots, air that is too dry, or even temperatures fluctuating between hot and cold can all make Phalaenopsis leaves turn yellow.

So when growing Phalaenopsis you need to observe carefully. When you see yellowing leaves, do not rush to water. Push aside the surface sphagnum moss and look at the roots--if the roots are wrinkled and gray, then it is underwatering, so quickly soak the roots in clean water for half an hour, and usually do not wait until the medium is completely dry before watering; if the roots are black and rotting, then it is too much water, and you need to repot and dry the roots right away. Once you figure out its temperament, the Phalaenopsis will grow vigorously and bloom abundantly.