Dain, I use 1/4 - 1/2 strength in every watering, depending on what time of year. My soil does not have a constant supply of nutrient within it.

I would also check to make sure that the discoloration is not from insects. Often mites damage appears as white speckles on top of leaves, but sometimes not until they are further along.

Rick

From High Colorado...almost desert.

I have two community pots with four Adeniums in one pot and five in the other. One of the four is getting lots of yellow leaves and one of the five is just starting to get some as well. All get the same care. Since the final one flower is withering I decided to start watering less. Either I am watering too much or the short days affect the plants or this very cold spell of weather has had some effect. It is not bugs. The room the plants are in gets up to 90 deg F these clear days and the house thermostat is set to 60 deg F at night.

I'm always glad to add my 2 cents! ;)

I have some doing this too. I think mine was because I let them dry out - completely. My others are soaked, and no yellow there, but my Socos dried up and I now have several yellow leaves.

Lastly, I just wanted to make sure, because I noticed you're not a Texan.

Did you say ya'll with a good bit of drawl? (it should rhyme with WALL. ;)

Happy New Year to ALL!

I am almost sure that it is caused by too intense LED light...

I would try Rick's advise and give this plant a feeding of 1/4 dose fertilizer. It looks like it could be a deficiency. Keep us posted on the progress Dain.

Tracy

Leaves of my thai socos and black RCNs

dried up inside the room despite the warmth and watering. Terminal buds are mostly intact and I have today let them out into ful sun and left them out for the night too.Maybe the shock treatment of hot day and cold night will induce them to grow some new leaves

I hope they start back up when temperatures climb Sinha.

Tracy

Dain, I stick to my explanation. ;-) Seedlings have an individual light tolerance (some even do poorly under lights) and I have seen the particular yellowing of the leaves before. But keep us updated.

If you have ruled out pests...

Usually when yellow/brown starts at tips of the oldest leaves (and first affects the oldest (bottom) leaves) it's a drought response - plant isn't able to absorb enough water at the roots, and the newest growth gets preference. Roots can have trouble absorbing water if too dry OR if kept too wet (lack of oxygen) - both conditions trigger the same drought response in canopy above.

But your issue looks to affect all leaves, maybe even newest leaves more - and seems to affect the whole leaf equally, not starting at the tip. Looks similar to chlorosis caused by some kind of nutrient deficiency to me (google about chlorosis many pix and much info). I'd fertilize with something that has necessary minors esp. calcium and magnesium.

When using gritty mix it is important to take care of nutrition, and maintain nutrient levels - one way is to use a weak-to-strong dose (depending on growth level/season) with every watering as Rick mentions. I tend to shift from 1/4 strength to full or even 1.5 or double strength as the season and growth rate changes.

But, I'm totally still a neophyte myself, and can't speak at all about potential affects from too much led light. But that's what my plant peeping radar says anyway.

Daniel

Thank you everyone for the responses. I'll keep you all posted.