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#16
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Wild life in flowerpots
I think that if the roots died as a result of a repotting injury a year ago,
they would be mostly gone, and only the thin, wiry core would remain (anyone know what that's called, by the way?). The fact that fungi were growing on the dead roots indicates that it's much more recent. You must keep in mind that having the roots submerged in any medium is most unnatural in the first place. For the most part the plants we grow are epiphytes that have their roots clinging to tree branches and hanging right out in the air, where the types and reactions of fungi are WAAAYY different. Surrounding the root system with a potting medium is for OUR benefit, not the plant's, so we have to keep it in a condition that is not detrimental to the plant. Being a scientist and engineer by background, I hesitate to make even marginally unequivocal statements when I do not observe something first hand, but I'd be willing to put money on the fact that your decomposing medium led to the loss of roots. While related mostly to semi-hydroponics, you might find this of interest: http://www.firstrays.com/roots_and_culture.htm -- Ray Barkalow - First Rays Orchids - www.firstrays.com Plants, Supplies, Books, Artwork, and Lots of Free Info! .. . . . . . . . . . . "Ben Lurkin" wrote in message hlink.net... OK, at this point, the fungus was growing only on the media and dead roots. I still believe that the roots died as a result of a bad transplant job a year ago last fall. I have kept potted plants for 60 years, but I still consider myself a newby with orchids. I cut away the dead roots rinsed with water and planted in new media. Would your experience indicate that the fungi begins in the media and then moves to the roots?? Saprophytic fungi excrete digestive enzymes to break down the dead organic matter, and then absorb the nutrients. Some of these enzymes could damage [read kill] roots of some plants. Of course I am speculating here. The fungus would grow on dead roots. In the organic garden; decomposition and disease fungi are different species. But, for anything in biology every rule has an exception. It is never safe to say always. Also in the crowded conditions of pots and a greenhouse, miner infestations can become epidemics. I never have a problem with cottony aphis outdoors, but when the plants come in, in the fall I must be observant. Some years one gets in and will multiply very rapidly without the predators that are outdoors. There are compounds available for killing fungi on some vegetables and roses at the organic gardening supply houses. These fungi live on the leaves defoliating and killing the plant. I use one on roses and another on cucumbers. As I have not previously had a root problem, I have not looked into a safe way of dealing with them. Many fungicides are extremely poisonous and not acceptable to me as an organic gardener. I will try and do more research in the coming weeks. Ben "Wendy" wrote in message news:AYWUb.16475$fD.2336@fed1read02... Interesting stuff Ben & if this fungus isn't detrimental to the plants, then it's not what some of my plants have. There was a time where it was so bad, I could pick out which cymbidiums' had the flak, (my word for this), just by how they looked. The roots were definately decomposed & a strong mushroom odor! It would be attached to everything, the pot, pseudos, roots & potting medium! I have lost a few plants too. So now everything gets a bath in Physan, before repotting. I would still like to try the recommended PrimaStop but as I mentioned they will not ship it to Calif.? -- Cheers Wendy Remove PETERPAN for email reply |
#17
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Wild life in flowerpots
Are you suggesting that it is possible to keep an orchid alive and growing
in a medium that contains pine and fir bark that is not decomposing????? Thank you for the reference, I do want to check out your SH methods, It will be a couple of days before I can get to it though. Ben. "Ray" wrote in message ... I think that if the roots died as a result of a repotting injury a year ago, they would be mostly gone, and only the thin, wiry core would remain (anyone know what that's called, by the way?). The fact that fungi were growing on the dead roots indicates that it's much more recent. You must keep in mind that having the roots submerged in any medium is most unnatural in the first place. For the most part the plants we grow are epiphytes that have their roots clinging to tree branches and hanging right out in the air, where the types and reactions of fungi are WAAAYY different. Surrounding the root system with a potting medium is for OUR benefit, not the plant's, so we have to keep it in a condition that is not detrimental to the plant. Being a scientist and engineer by background, I hesitate to make even marginally unequivocal statements when I do not observe something first hand, but I'd be willing to put money on the fact that your decomposing medium led to the loss of roots. While related mostly to semi-hydroponics, you might find this of interest: http://www.firstrays.com/roots_and_culture.htm -- |
#18
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Wild life in flowerpots
Let's put it this way: ABSOLUTELY YES, one can grow orchids very
successfully in media that are not- and do not decompose. I have been doing so for years - clay aggregate, rock wool, the outside of clay pipe and inverted flower pots, empty clay flower pots, and even Styrofoam peanuts (takes way to much watering and tips over too easily, I recommend against it)! I would also easily extend that statement to include pristine bark (I cannot speak for pine - most pine bark in the US is generally unsuitable as an orchid medium, and fir bark is the norm), except that I imagine it is hard to find bark that is not decomposing - it IS a dead, organic material. Seems to me that it's a matter of degree - starting out very, very slowly, then accelerating with time as the populations of the microorganisms responsible for the breakdown multiply exponentially. The simple fact is that epiphytic orchids get little-to-no nutrition from the media they are grown in, with the one significant exception being osmunda, which breaks down and releases nitrogen and other compounds which the plant can use. The decomposition of other media can actually compete with the orchid for nutrition. That's the basis of the high-nitrogen "Orchid food" fertilizers: the micro-critters consume a lot of nitrogen, so it is artificially boosted in the fertilizer formula to compensate. As more and more is learned about the needs of the plants, and the materials used as media become less prone to rapid decomposition, that isn't as much of an issue, so the extra nitrogen is to be avoided, as it can negatively affect blooming is used to excess. Most successful orchid growers that DO use organic media repot the plant into fresh media before the old material has any significant degree of decomposition. The plant really isn't getting anything from the decomposition products, and is more at risk to get rotted roots as a result of its presence. -- Ray Barkalow - First Rays Orchids - www.firstrays.com Plants, Supplies, Books, Artwork, and Lots of Free Info! .. . . . . . . . . . . "Ben Lurkin" wrote in message hlink.net... Are you suggesting that it is possible to keep an orchid alive and growing in a medium that contains pine and fir bark that is not decomposing????? Thank you for the reference, I do want to check out your SH methods, It will be a couple of days before I can get to it though. Ben. "Ray" wrote in message ... I think that if the roots died as a result of a repotting injury a year ago, they would be mostly gone, and only the thin, wiry core would remain (anyone know what that's called, by the way?). The fact that fungi were growing on the dead roots indicates that it's much more recent. You must keep in mind that having the roots submerged in any medium is most unnatural in the first place. For the most part the plants we grow are epiphytes that have their roots clinging to tree branches and hanging right out in the air, where the types and reactions of fungi are WAAAYY different. Surrounding the root system with a potting medium is for OUR benefit, not the plant's, so we have to keep it in a condition that is not detrimental to the plant. Being a scientist and engineer by background, I hesitate to make even marginally unequivocal statements when I do not observe something first hand, but I'd be willing to put money on the fact that your decomposing medium led to the loss of roots. While related mostly to semi-hydroponics, you might find this of interest: http://www.firstrays.com/roots_and_culture.htm -- |
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