Yellowing of leaves

Kingston, ON

Hoya Carnosa cuttings were succesfully rooted and growing hydroponicaly. Leaves now fading from healthy green to pale yellowish.
A mature one year old Hoya Bella showing signs of same coloring. What am I doing wrong?
Any suggestions as to how I may correct the situation.

Palm Bay, FL(Zone 9b)

It sounds like too much water to me. I root mine in perlite, just barely moist. I tried using hydroton but had poor results on one hoya, a caudata cutting. It never rooted for me.

Kingston, ON

Thanks imadigger. I'll cut back on the water and probably give up on the hydroton.

noonamah, Australia

I'd be surprised if any Hoya survived hydroponic growth. They're more likely to survive drying out.

Oakland, MD

you should definitely let them dry out before watering.

Chicago, IL(Zone 6a)

Not sure if it is the water. I've seen Cacti happily growing hydroponically.

How about fertilizer? How much, what kind, how often?

What kind of water do you use for your hydroponics? Tap, well, R/O?

Last but not least: How about sun and heat exposure? Did you move the plant? Is it exposed to cold drafts?

Kingston, ON

I'm surprised at the vast differences voiced re hydroponics. I have Carnosa, Obovata, Publicalyx, Watetti and Bella all doing quite well hydroponically but the yellowing of leaves has me baffled. I use tap water, fertilize with 20/20/20 and all plants sit in east facing windows. At eighty-six years I'm not a novice when it comes to indoor gardening but will happily accept any and all suggestions. I still have a lot to learn. Thanks everyone.

Chicago, IL(Zone 6a)

I have had leaf yellowing on carnosa only when the plant was stressed and that's why I was going down the list of "usual suspects".

Well, the only other thing I can think of is to check the roots for rot.

And the one thing that can be a royal pain in the behind with anything hydroponics would be salt buildup from the fertilizer. That can result in yellow leaves, brown edges etc.

Deep East Texas, TX(Zone 8a)

Wow! At 86 and still gardening and on the computer??? I want to grow up to be just like you!!! 8 )

Are all the leaves yellowing or is it just a few? I find a few older leaves on the Hoyas turning yellow and dropping. If all the leaves are yellowing that would not be it. What type of fertilizer do you use and how often?

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