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[Mandrake]

It could also be nutrient lock out due to calcium deficiency. A easy symptom to look for is twisted stunted new growth.

Looking at saros' picture, I'm not that sure about that. Calcium is not mobile, it does not travel easily inside of the plant, and symptoms for Ca defficiency appear more clearly in new growth. Calcium defficiency will twist new growth and necrosize young leaves, but it should not make the whole plant turn yellow.

I'd try first foliar N fertilizer, but it's your pick.

Regards,

Mandrake

[Saros]

Thanks Mandrake, I will try foliar N fertilizer first and see what happens before moving on to adding calcium, iron, etc.

[Cane Blossom]

yea, i would have ruled this out a day or two ago, but this new leaf set coming in is smaller than its peers (which are now, not only no longer smaller, they are actually a tad bigger).

i think this may be a nutrient problem after all

[nobody]

It could also be nutrient lock out due to calcium deficiency. A easy symptom to look for is twisted stunted new growth.

Looking at saros' picture, I'm not that sure about that. Calcium is not mobile, it does not travel easily inside of the plant, and symptoms for Ca defficiency appear more clearly in new growth. Calcium defficiency will twist new growth and necrosize young leaves, but it should not make the whole plant turn yellow.

I'd try first foliar N fertilizer, but it's your pick.

Regards,

Mandrake

The reason i said that was; if there are several plants in the same area and only one or two have problems it might be a nutrient uptake problem. If it is a uptake problem it would present its self in several different ways, n deficiency, mag deficiency etc. This could be caused by several things, calcium is not mobile but it does play a key part in nutrient uptake and distribution, lack of beneficial fungi in the soil, pests in the soil (mealy bugs on the root), a build of of fertilizer salts, too much  water or a host of other things. Nutrients can not be directly absorbed by plants, there has to be something there to convert it for the plant.

I did jump the gun and did not provide a clear explanation with my other post., I apologize.

 Mandrake is right start with a foliar spray, if that does not help start slowly eliminating other possibilities before changing the soil composition.

[nobody]

sorry, to clarify further my post was directed towards saros. I´m usually no help with seedling problems as i have many myself.

[yurem]

Can't it just be different genetics between the seeds that is making only these seedlings to be different?

[New Wisdom]

Yellowing of the leaves usually is a different issue ime. Wether it is nutritional, water/light related, or a bug infestation.  But maybe it could be.  I don't know enough about mimosa hostilis to say for sure.

[yurem]

I just thought that, being all the other factors equal between all the other plants, like soil, light, water schedule and all, the only diference between them is the DNA.
But this is a conclusion that must only be used if all the other possible causes had been tested!

[New Wisdom]

I just thought that, being all the other factors equal between all the other plants, like soil, light, water schedule and all, the only diference between them is the DNA.
But this is a conclusion that must only be used if all the other possible causes had been tested!

For sure.  I'm interested to see what happens. 

Let us know when you figure guys figure it out.

[Cane Blossom]

just an update:
the mimosa is green now.  the leaves are considerably smaller than its peers, but there are more of them (a pseudo-bonsai of sorts). as for the size of the whole plant, it is no longer the biggest plant, but it isn't the smallest either.

of course the other mimosa have been so variable as of late, its hard to pin this yellowing issue down on anything. but basically my feeling is that if your mimosa seedling is yellow, its probably a non-issue (my healthiest mimosa has continually been under the initial conditions - still in the dense red dirt and everything).

the first pic is the formerly yellow seedling
the second is the biggest/healthiest mimosa

[New Wisdom]

Wow.  Your seedlings look a lot nice than mine.  Mine is a lot older than yours too! 

How much sun does that little guy get?

[Cane Blossom]

Wow.  Your seedlings look a lot nice than mine.  Mine is a lot older than yours too! 

How much sun does that little guy get?

~12 hours of blazing heat a day (enough to sunburn the piss out of me)

[New Wisdom]

So they like being out in the sun? Even as a seedling?

[Saros]

Mine seem to like as much sun as they can get.. though they weren't introduced to it until they were at least 8" tall.

I have noticed that on the brightest days, the leaves close up a bit.

Another interesting thing I noticed is that one has a very red trunk on the sun-facing side.. maybe coincidence but half is green and the half facing the sun is red. I'll get a pic.

[New Wisdom]

Yeah, I just put mine outside and it closed it's leaves in about 3 minutes.  I could hear it saying, "Oh heeeeell no!" I think if i acclimated it to the outside it would benefit though. There's a lot of good sun out there.