Orchid Q&A

* Air Conditioning
* Ansellia africana
* Aquarium Water
* Brassavola Care
* Black Growths
* Brassavola Care
* Calanthe Culture
* Catts in Hawaii
* Change of Environment
* Cymbidiella rhodocheila
* Culture of Alba Orchids
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* Dendrochilum magnum
* Dormancy
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* Fertilizer Injector Dosage
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* Jewel Orchids
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* Leaf Color
* Leaf Residue
*
Leaftip Burn
* Liparis viridiflora



Q.

Fertilizer Injector Dosage
In setting up my fertilizer injector over the weekend, I had trouble understanding the table of dilutions for making the stock solution. The tables are based on ppm (parts per million). Can you tell me what range of ppm for nitrogen is appropriate for the "weakly weekly" fertilizing of orchids? I have also noticed small, shiny black spheres on some of my plants. Do you have any idea what these might be? — Sandy Denman

 

A.

According to Thomas Sheehan, PhD, the recommended range for most floral crops is around 200 ppm of nitrogen. I would say that 100 to 150 ppm would qualify as the minimum dose for the more frequent feeding. The small, black spheres to which you refer are the spores of the wood rot fungus that is always present in bark-based composts. They are not harmful, just unsightly. — Ned Nash




Orchid Q&A

* Masdevallia coccinea
* Mastering Miltonias
* Maxillaria sophronitis
* Mealybug Infestation
* Meristemming Monopodials
* Missing Pollen
* Night Length
* Night Lights
* No Flowers
* Non-flowering Doritaenopsis
* Oncostele Wildcat
* Oncidium Sharry Baby
* Orchid Honeydew
* Paphinia herrerae
* Paphiopedilum armeniacum
* Paphiopedilum delenatii
*
Phaius Culture
* Phalaenopsis Problem
*
Phalaenopsis Spiking
* Plant Sitter
* Rainwater Collection
* Redwood Bark
* Re-rooting Plants
* Spotted Oncidum Leaves
*
Sticking Flowers
* Storing Pollen
*
The Larger the Better
* Vanda Keiki
* Virus Question