Reasons Why Hydroponic Phalaenopsis Orchids Won't Grow Roots and an Analysis of Their Light Requirements

Have you ever tried growing a Phalaenopsis orchid in water? Do you watch other people's water-grown orchids throwing out roots like crazy, while yours stays bare with not a single new root, and you stamp your foot in frustration? Well, that used to be me -- I always thought water culture was easier than growing in soil, but after all that fussing, the orchid's roots either stayed limp and never pushed out, or rotted down to half their length, and in the end I could only watch as the leaves yellowed and withered.

It wasn't until I vented in a gardening group chat one time that a veteran tossed out one line:"Growing a Phalaenopsis orchid in water isn't just about dumping it in water, you know? Its roots are pickier about their environment than you are!" Only then did it dawn on me: those water-grown orchids that never grow roots have all stumbled on the  "invisible conditions" like temperature and light.

Take the one I had last year. I excitedly moved it into a clear glass vase for water culture and put it in a corner of the living room, thinking "cool and out of the light"was just right, but a month later, the old roots slowly turned gray and there was no sign of new roots at all. Later I learned that it was sitting there "freezing"every day (the temperature was only 16°C), so forget about growing roots -- it was lucky just to stay alive -- this wasn't growing an orchid, it was putting it in "cold storage" !

Today I'll break down these "root-growing codes" clearly, and even the laziest person can learn it!

Taketemperaturefirst. If the temperature is off, it'll "go on strike". It will only grow at25-30°C, and below 18°Cor above 35°C, it just shuts down.

Lightis also non-negotiable. You have to give it enough scattered light every day -- 6 hours of it, otherwise the roots won't have the strength to push out.

Root careneeds even more attention: at least 1/3 of the roots must be left out above the water to breathe; soaking them too deep risks suffocation. When you first start water culture, change the clean water every 1-2 days, then once every half month after roots form; cloudy water easily causes root rot.

As fornutrition, if you want the roots to grow happily, give them a little "sweetener"now and then: add 1000 diluted rooting solution for the first water culture, then top it up once every20 days; each week, soak 1/3 of the roots in cooled tea for a day, then let them dry for half a day, to encourage aerial roots to push out.

Rootsthat have rotted -- don't throw them out either. Cut off the black, hollow roots, soak them in carbendazim, let them dry, then suspend the roots above the water with a cotton string (one end dipped in the water); they may still push out new roots. Use a clear container so you can observe easily, and cut away any roots that turn to mush or go green; control the temperature in spring and summer to prevent algae.

Really, once you understand its habits it isn't hard: enough temperature, enough light, and roots that aren't smothered, and it will happily grow new roots on its own~