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[IBC] Two Points
After repotting a number of different species this spring, I have found
one constant; cactus mix does not work. I mention this because most of the local club "experts" recommend it and use it in one form or another. Some mix in some grit, some use it by itself. After buying trees from three different people who use it, I have found the same problem with all of their trees; the roots are few and unhealthy looking, i.e. they are thin, weak and dark, falling off easily during repotting. Cactus mix is mostly fines, up to 90%. It causes the water to sit for a length of time on top of the soil until it slowly passes through. I have tried different combinations of it with coarser components and it still tries to keep water from penetrating the mix. Which brings me to a second finding. We are not only developing a trunk but also a thick, dense rootpad, of which I have only seen developed in a coarse mix. A mix with particle size of 1/8 to 1/4. These findings have been consistent through the different species, even accents and grasses. We always hear about developing trunks, but not much on developing rootpads. After killing numerous trees in my first year I see that the roots are the key to a healthy, vigorous, developing tree. In other words, no more cactus mix in my pots. Brian Sunset Zone 12 Tucson, AZ ************************************************** ****************************** ++++Sponsored, in part, by Ken Rutledge++++ ************************************************** ****************************** -- The IBC HOME PAGE & FAQ: http://www.internetbonsaiclub.org/ -- +++++ Questions? Help? e-mail +++++ |
#2
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[IBC] Two Points
At 08:34 AM 3/7/04 -0700, Brian Berggoetz wrote:
After repotting a number of different species this spring, I have found one constant; cactus mix does not work. I mention this because most of the local club "experts" recommend it and use it in one form or another. Some mix in some grit, some use it by itself. ..... Brian I noticed the very same thing at our club meeting last week. Someone had brought a bag of cactus mix and it was awful looking stuff, far too peaty for me. I think the manufacturers of this stuff make the same mistake as a lot of other folks looking for a shortcut to a good bonsai soil mix. That is, if you add a coarse aggregate to an otherwise dense potting soil, you will get a mix that is better draining. This is NOT true. Adding a coarse aggregrate just makes concrete out of mortar. In other words, the basic small particle size of the peaty mix is the controlling factor. as long as there is enough small particle mix to fill the interstices of the coarser elements, then there will not be any significant difference in drainage or aeration. From this, you can see that you have to get the small particle percentages very low before the soil characteristics will change. That is why screening is such a common practice in bonsai. It is far far better to remove the fines than it is to try to overwhelm them with coarser material. Of course the quantitative numbers will change with particle size and shape, but something of the order of 5 to 10% fines will begin to cause problems, or to hold more water, if that is what you desire. Over 10%, will begin to drastically change the soil characterisitics. I know, I know, there are a bunch of you out there that NEVER screen your amendments. All I can say is that you are probably already using some pretty clean materials to start with or you are adjusting your watering habits to make up for the increased water retention. But, I am almost willing to bet, that if you screen some of your soil mix, you will come up with less than 10% fines. ************************************************** ****************************** ++++Sponsored, in part, by Ken Rutledge++++ ************************************************** ****************************** -- The IBC HOME PAGE & FAQ: http://www.internetbonsaiclub.org/ -- +++++ Questions? Help? e-mail +++++ |
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