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  #1  
Old 11-28-2018, 09:28 AM
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Restrepia leaves yellowing
Default Restrepia leaves yellowing

My Restrepia antineffera seems to have a yellowing of the leaves issue going on. The roots have really started to take off.... Any suggestions on what might be going on and/or how to correct it?



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Old 11-28-2018, 10:54 AM
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How about providing some feeding details?
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Old 11-28-2018, 11:59 AM
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Quote:
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How about providing some feeding details?
I don't fertilize very often, but recently switched to Dyna-Gro 7-9-5 (about 2/3 strength).... fertilized about 3 weeks ago...not sure if that correlates to the yellowing. The yellowing became more noticeable about a week ago. Are you thinking over fertilized???
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Old 11-28-2018, 06:30 PM
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I don't fertilize very often, but recently switched to Dyna-Gro 7-9-5 (about 2/3 strength).... fertilized about 3 weeks ago...not sure if that correlates to the yellowing. The yellowing became more noticeable about a week ago. Are you thinking over fertilized???
What does "2/3 strength" mean? What water supply do you use?
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Old 11-28-2018, 06:39 PM
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Full strength would be 1 teaspoon per gallon so I would use use 2/3 of a teaspoon to a gallon on water
Water is 18megaohm deionized water
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Old 11-29-2018, 09:39 AM
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Full strength would be 1 teaspoon per gallon so I would use use 2/3 of a teaspoon to a gallon on water
Water is 18megaohm deionized water
I think the issue is gross underfeeding, and possibly pH!

By using ultra-pure water, the calcium and magnesium compounds typically found in water are missing.

Dyna-Gro 7-9-5 is not bad (besides being expensive per nutrient unit), and can replace those, but I would use a full teaspoon per gallon every week.

Orchids are not particularly demanding of mineral nutrients, but should get a steady supply as while some nutrients can be transferred from old tissue to newly-growing parts, others cannot. That plant has grown a great deal, so possibly has "tapped out" the reserves.

The first thing I would do, when seeing yellowing, is water with a teaspoon/gallon of Epsom Salts. The lack of green often means a lack of chlorophyll, which usually means a lack of magnesium.

Then, after a few days, I'd rethink your feeding regimen, and start applying some regularly. I'd also check the pH of Dyna-Gro when in such an unbuffered water supply; it's probably very low.
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Last edited by Ray; 11-29-2018 at 09:43 AM..
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Old 11-29-2018, 09:50 AM
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Thanks Ray....very interesting. I was told to be careful not to over fertilize miniature/terrarium plants...so I've been cautious....I'll give it a shot...thanks for the advice
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Old 11-30-2018, 12:07 PM
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Quote:
Originally Posted by Ray View Post
I think the issue is gross underfeeding, and possibly pH!

The first thing I would do, when seeing yellowing, is water with a teaspoon/gallon of Epsom Salts. The lack of green often means a lack of chlorophyll, which usually means a lack of magnesium.

Then, after a few days, I'd rethink your feeding regimen, and start applying some regularly. I'd also check the pH of Dyna-Gro when in such an unbuffered water supply; it's probably very low.
Ray...The pH of the 18 megaohm water is 6.23
I made up a solution of the Dyna Gro and the pH is 4.13...would you consider that pH level safe to fertilize with?
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Old 11-30-2018, 08:17 PM
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You're right, it's easy to build up minerals in an environment that doesn't get flushed. Maybe a full teaspoon is too much, but whatever you do - 1/4 tsp/gal weekly? - apply it regularly.

Yes that pH is low, but I'll bet the substrate the plant is in will take care of that readily.

Don't forget the Epsom Salts.
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