When it comes to root health, pots with gas permeable walls carry the day. Terra cotta clay pots are better than plastic or vitrified clay pots and fabric pots are better than terra cotta clay. The reason is greater gas exchange through container walls and the fact that an increase in gas exchange comes with an increase in evaporative water loss, which can be a lifesaver when using water retentive media. There will still be a PWT in these pots, and for any given medium it will the same ht in a pot with rigid sides as in the fabric or air pots at container capacity. Container capacity is a measure of how much water the grow medium in a pot or container holds at the moment it has stopped draining after having been watered to the point of complete saturation. The ht of the PWT and how long it affects root function is usually key/critical in determining what opportunity a plant will have to realize as much of its genetic potential as possible (within the limiting effects of other cultural influences). The factor that most affects the ht of a PWT is the size of the particles from which the medium is made. So, reducing the duration of PWTs limitations increases the opportunity for plants to realize a greater measure of their genetic potential. But wait! There's a more important consideration. If you place your fabric containers directly on the ground/soil, from the perspective of hydrology it changes the fabric container to a raised bed; this, because water is free to move through the fabric between the grow medium and the earth, with the earth acting as a giant wick. This means, because of the increase in the force of adhesion in the mineral soil beneath the pot (due to a mineral soils much larger o/a surface area on a per volume basis), water in the soil will be pulled downward with enough source to overcome the capillarity holding it perched in the container. As long as you don't place the fabric container on coarse sand, peastone, or other large particles, the earth will likely pull all perched water from most media one is likely to use in a container. I've mentioned this and the fact that healing in your pots situating them directly on top of soil turns them into raised beds. the only caveat being it's essential that there is a 'soil bridge' so there is continuity of the soil column between the soil (earth) and the grow medium in the container, through the drain hole(s), so water doesn't have to jump an air gap to exit the container. This applies more to pots with rigid walls and is not a factor when discussing fabric containers. Al

Welcome, Rina! I'm no orchid expert, growing only a few, myself... I would like to become a lot more accomplished at growing some of the many types, though... they're so beautiful! Actually, I grow mostly Amaryllids, a couple of Hoyas, and an assortment of other plants. But I do so love orchids! I do know that Ludisia orchids are terrestrial and require different medium and culture than your Phals do. I would not recommend the 511 for your Phals, although a lot will depend upon the environment you have to grow in. I'm stuck with a very dry indoor environment, myself, and I grow most of my plants in an east facing window. Everything I read these days says that Phals are one of the easiest orchids to grow in the average home environment, but I have NOT found this to be true in my case! I've killed several, and I cannot figure out what I'm doing wrong. I've read and researched, tried different mediums and methods, and they simply do not like what I have to offer them, apparently. However, I find that Dendrobiums do much better for me, and seem to be doing very well in a slightly altered rendition of Al's Gritty Mix. In fact, I recently had a young plant develop nice buds... though they ended up shriveling up and dying before they had a chance to open. I am determined to learn enough, and perhaps sacrifice enough orchids, to become successful at growing and blooming them. It is often said that a person can't be called a true orchidist until he or she has killed at least a hundred plants in the learning process... or something to that effect... and though I hope this is not true, I've lost many different types within the past several years. I'm still determined, and I'm not ready to give up just yet! So far, two Dendrobiums, one Encyclia, and a Cymbidium backbulb are all surviving, and even thriving! They're all in a Gritty Mix with more bark than other ingredients, all minus the turface... and the Cymbidium has a tad bit of chopped up sphagnum moss pieces added, just to help retain a little more moisture around the newly grown roots. My question to you, Rina, is what type of environment do you grow in, and what are the average conditions like? As in light, humidity, average temperature, the mediums your plants are in currently, your watering and feeding habits, and anything else you can think of... perhaps we can help!

I've never posted in this forum, and I don't want to spend a lot of time introducing myself, but since 2002 I have moderated three organic lawn care forums around the Internet. I live in San Antonio and have noticed the mention of Malcolm Beck in another post by strawberryhill. That made me feel a little at home here. I have met Beck on many occasions as he had a monthly organic gardening community meeting running for a year or so in the early 2000s. Malcolm is considered the father of organic gardening in our part of Texas and has a huge following, so it is nice to see his mention in this forum. I have an observation or two (or a lot more) on this forum, but in the context of this thread, I'd like to hold my keyboard back somewhat. All my focus has been in lawns for these years, but in the course of many meetings and keeping my ear to the ground, I have learned a little about how the community cares for roses. First of all, to answer a question asked way up on this, the application rate for molasses over an area is 1 gallon per acre which equates to 3 ounces per 1,000 square feet. For spraying roses, the San Antonio organic community typically uses 3 ounces of molasses along with 3 ounces of liquid seaweed per gallon of water. Spray the undersides of the leaves and all surfaces of the plant. What this apparently does is feed the microbes living on the outside of the plant and those microbes help ward off sucking pests. If you add 3 ounces of garlic juice to the mix, it helps keep thrips off the roses. If you have not already discovered it, check your local farm and ranch co-op to see if they sell bulk molasses. Bulk molasses is sold by the pound. I think the current price is around $0.15 per pound which equates to about a $1.50 per gallon. This stuff is feed grade molasses, not food grade. Also I'd like to respond to somethings strawberryhill said above. This might be long so get comfortable. I have the same good results breaking up my rock hard dolomitic/limestone clay here with gypsum. I was digging a hole and stopped at rock-hard limestone at the bottom. I sprinkled gypsum, poured some water, and took a few hours break. I came back, and the bottom was softened enough to fish out more stones. I would highly suggest you get a soil test done before adding anything like gypsum to your soil. The best soil test lab in the country seems to be Logan Labs in Ohio. By best I mean bang for the buck as well as reliability in their test results. For $20 you get testing done that would cost up to $100 at most university soil test facilities. At LL that is their normal test so they are very experienced to doing it. At a university these would be considered "extra" and they'd have to order chemicals and relearn how to do the test. And in general, adding gypsum type calcium to a soil that is already calcareous seems like the wrong approach. In the past I dumped peat moss (pH 4), or alfalfa meal (pH 5.7) at the bottom of the hole. BIG MISTAKE ! Those fine particles glued up with my sticky clay ... and became concrete. University of California Extension listed 1 ton of gypsum as equivalent to 5.38 ton of sulfur. The only thing I would put in the bottom of the hole would be micorrhizal fungi and possibly rock phosphate. I also tested how sulfur soften my clay ... takes way longer than gypsum. It took at least one month for the sulfur to have an effect. A bit of gypsum is 5 times more effective than sulfur to soften clay, also to de-salt saline soil. First of all I would disagree with making this sound like a blanket statement. Gypsum does not soften soil except in special circumstances. Sulfur is a fungicide which kills the beneficial fungi which normally soften soil. So sulfur would be a bad idea for softening the soil. In the lawn community there are commercial surfactants sold to soften soil for professional sports complexes and golf courses. The cost roughly $70 per gallon which is out of reach for most home owners, but not out of reach for one of the moderators I worked with for several years. He also happens to be a soap hobbyist and junior chemist. Basically he tried the various surfactant materials and found they worked fantastic. Then he reverse engineered them and examined the ingredients. Then he bought those ingredients on eBay and started experimenting. As his basic tool he uses a screwdriver. Stab the screwdriver into the ground and measure how deep it goes. Then soften the soil and measure the penetration. Then along I came and simplified his approach. I have been recommending the use of baby shampoo at the rate of 3 ounces per 1,000 square feet. Apply to the soil and immediately follow up with 1 inch of water. A week later give another inch of water. A week after that reapply the shampoo and inch of water. That should set up the soil environment to favor the beneficial fungi which normally keep the soil soft. In the typical lawn this has worked across the country. In my yard after watering my soil is almost too soft to walk on without turning an ankle. That moderator experimented with increasing amounts of his surfactant to see how deep his soil would soften. He got up to about 50 ounces of surfactant per 1,000 square feet every week for months. There was no problem to the lawn (but I would redo this for roses to be sure). As far as softness, basically he ran out of screwdriver and had to resort to other measuring devices. I believe he was at a comfortable 20 inches or so of pretty soft soil (he's north of Philly). Another mod had a tree limb bury itself 27 inches deep in his lawn. So I would highly recommend trying this. Molasses & gypsum & sulfate of potash to lower alkaline water: It works better than vinegar, I wilted a few roses by watering plus vinegar in high heat. I tried used lemons last year, didn't green up. Molasses is thick so I dilute molasses with water, before adding the other 2 powders and shake the bottle. Then I use 1 teaspoon of that pre-mixed solution per 2 gallons water. Here's the basics if used from concentrated. Again making the blanket statement that gypsum is good for the soil is not going to work for many people. Certainly it won't work in Texas where most of the soil is limestone with a pH of 8.0. Normally we use vinegar instead of RoundUp to kill plants. Spraying it on plants is one thing (non selective herbicide), but using it on the soil is another (carbohydrate bacteria food). And I'm also interested in the mention and use of potassium sulfate (sulfate of potash). That is not an organic material. That is salt. I realize it is used in every commercially branded organic fertilizer, but that is why I never use those. So I'm curious why it is so prominent in an organic forum and what it does to enhance rose health or production. One teaspoon of thick molasses per 2 gallons of water, beyond that will turn the edge of leaves brownish (I did that to Gina's rose, most likely from the 20% iron of molasses). Wholesome Organics (zero salt) and Plantation brand (low-salt) also has 15% calcium and 20% potassium. I have not heard of any problems using 3 ounces of molasses per gallon. I'll check into this further. The purpose of adding sulfate of potash and calcium sulfate (gypsum) is to utilize the sulfur part to green up roses, and neutralize the lime in tap water. Again this only applies to calcarious soils, but I believe there is a much better material to use. Sulfur is a fungicide surpassed only in potency by most sulfates. If you want to harden your soil, the first thing you should use to kill the beneficial fungi is sulfates. If you have calcarious soil, you'll be better off using greensand (if you can find it) and mulching with a shredded tree mulch. As the mulch decomposes the organic humic acids from that process will do more to acidify your soil than sulfur. Any tree trimmer has the material you need. One teaspoon of gypsum powder per gallon of water, beyond that will make plants more prone to fungal diseases (rust and black spots). Too much calcium drives down potassium, necessary for disease-prevention. Instead scatter whole ground corn meal (the kind you cook with or animal feed) around the base of your roses. Cornmeal attracts the trichoderma (try koh DER mah) fungus. Trichoderma is a predatory fungus which feeds on the cell walls of other fungi. This research was done on peanuts at Texas A&M in Stephenville. They have suppressed the research and recently took it off the web. Basically what they found was that peanuts, which normally develop a fungal disease over the course of a season, had to be rotated with a non-fungal crop every year. By using ordinary corn meal on the ground (20 pounds per 1,000 square feet), they were able to use the same soil to grow peanuts year after year. I tried it on my roses and the PM and black spot disappeared in a 3 weeks. Corn meal is also a weak organic fertilizer so there is certainly no harm to try this approach. There was a lot more about the use of potassium sulfate and gypsum, so while I believe those are not good for an organic garden, I am interested to know why y'all thing they are.

Got curious about compost tea. This is the second time I checked. Early this summer time I spent 1 hour researching but was disappointed. Here's one link from United Kingdom on compost tea (unbiased, NOT sponsored by compost-tea industry): http://www.telegraph.co.uk/gardening/gardeningadvice/11121288/Compost-tea-does-it-really-work.html " What did they find? In a glasshouse study on lavender and choisya, none of the compost teas had any effect on growth or on susceptibility to botrytis (grey mould) or spider mites. Sometimes plants treated with compost tea were taller, sometimes they were shorter, sometimes there was no difference. Sometimes plants treated with compost tea were of higher quality, but often they weren’t, and treated choisya plants at one nursery were significantly worse. In short, the effects of compost teas were “extremely inconsistent”. Other links from U.S.A: http://www.walterreeves.com/landscaping/compost-tea-does-it-work/ From University of New Hampshire: https://extension.unh.edu/articles/Does-compost-tea-really-work From University of Vermont: http://www.uvm.edu/vtvegandberry/factsheets/composttea.html Excerpt from above link: " It’s not clear whether it’s necessary to aerate during compost tea production. Aeration can speed up the production time, but it may also add to equipment cost and complexity. There are claims that aeration helps kill off the organisms that can cause illness. Very few studies have compared aerated and non-aerated compost teas. Some recent research. A 2-year study by the Rodale Institute and Pennsylvania State University evaluated the use of aerated compost tea for disease suppression and crop stimulation in grapes, potatoes, and pumpkins. During year one, approximately 50% suppression of powdery mildew was observed in the compost tea treated grape plots. A slight reduction of gray mold, along with an INCREASE in the level of downy mildew, was observed in the compost tea treated plot during the first year at one of the vineyards. Compost tea failed to suppress powdery mildew on Howden pumpkins in year one, but reduced the number and size of pathogen colonies in year two. Compost tea did not reduce severity of late blight on Superior potatoes when disease was present in year two. " http://www.uvm.edu/vtvegandberry/factsheets/composttea.html *** From Straw: FOR ROSES, just spraying with alkaline tap water alone is enough to suppress mildew, as testified by Roseseek (Kim Rupert) in CA and rosarian Dave Boyd in HMF. For mildew, just plain tap-water spray (alkaline pH over 8) is enough to contain mildew, as rosarian Dave Boyd in a dry climate (only 13" of moisture per year) testified in HMF: http://www.helpmefind.com/gardening/l.php?l=3.4748