I hate it when that happens.
Doesn't vermiculite contain other bad substances, too? Maybe my dislike for it is founded after all.
Scot does remind me of one of my perlite-peeves with this post: it seems to me that sphagnum top dressing grabs hold of peat and maybe even peat/sand better than perlite/peat. Plus, if you want to harvest the sphagnum later it is bound to have perlite in it.I am "anti-perlite", for CP-use, for four reasons:
1. newbies to the hobby sometimes think they need it, (because they read they need it)
so they get perlite with fertilizer added, because they dont know any better, and they poison their plants.
and I dont use it myself because:
2. It floats to the top.
3. It's ugly.
4. I cant think of any benefit to using it.
Add to my list the powder, oh I hate the powder .
Why has no one mentioned the powder!
Powder, as I recall, was an excellent movie, however.
I’ve got to stand up for the much maligned Perlite,
I have never ever washed perlite before use, why is it necessary?
Perlite does float when full of air, but you get it wet, as it should be in a bog or bog plant pot, its buoyancy is very low, so low it wont overcome the weight of peat above it and float.
I contains huge amounts of water and or air.
It opens the texture of the substrate.
Light and easy to handle and measure.
I have found using it in bogs for years, that it doesn’t inhibit sphagnum growth, it also turns green when on top of the substrate so doesn’t look so unsightly after a while (and who cares anyway, put some gravel or peat over it if it offends) and if it does ‘float’ to the top, (rather than the peat for sinking, nobody blames the peat for sinking do they? Oh no! it's got to be the perlites fault hasn't it) one assumes that being so light it has the good grace to get blown off and away by the wind, although this doesn’t seem to happen, curious.
Last edited by Steve Booth; 11-18-2013 at 08:59 AM.
good defense of perlite!
but..your only benefits to the plants themselves are:
I can see how that can helpful for houseplants..but why would you want either of those things for CP's?It contains huge amounts of water and or air.
It opens the texture of the substrate.
(im talking about mainly VFT's and Sarracenia..Perlite for Nepenthes and Pings can be (and should be) a completely different conversation.)
VFT's and Sarrs, in the wild, live in very wet peat bogs..
their roots are designed to be in contact with more water, and less air, than most plants..
yes, they dont need to be 100% saturated with water, and there is some air in the peat and sphagnum,
but why would you need perlite to *increase* the amount of air in the mix?
the plants dont want or need increased air in the mix..
If sphagnum and peat is what the plants grow in, in the wild, then it seems to me that sphagnum and peat
in the ideal media to grow them in, in captivity..
(I also dont like sand in VFT and Sarr mixes, for the same reasons..if they dont grow in sand in the wild (which they dont)
why should I add sand to my mix? again, I see no benefit or reason for it..)
so it comes down to..what is the benefit to using perlite for VFT's and Sarrs?
I see zero benefit, or need, or use, for perlite..
perhaps using it (if its clean) is "neutral"..no gain, but no harm..
but if that is the case, why use it at all?
I think perlite use for VFT's and Sarrs is a "myth" that hasn't quite died out yet..
people still use it just because they think they should..just because they read it somewhere..
it probably came over from the houseplant world: "perlite is good, you want it in your mix, period."
but does it offer any *real* benefit for "bog" CP's?
IMO, no, it does not..
My CP page: http://1stclass.mylargescale.com/scottychaos/CP
I've used mortar/concrete sand (used in construction), for many years.
It's the perfect grade, course, construction grade, heavy, course sand, mixed with tiny pebbles.
The sand comes in 25 lb bags for about $5.00.
You can only find it in the lumber/builders dept. at LOWES!
There's nothing wrong with Perlite as a soil component as long as you are using it wisely, and in the right context.
1) As others have pointed out, there's no need to use Perlite in soil mixes for North American terrestrial CPs like Sarracenia, since it doesn't bring anything beneficial to the equation; sand and peat are the two components that are much more suitable for Sarracenia/Dionaea. Perlite is more useful in a Nepenthes media formulation, where the coarse chunks help make a very airy, fast draining media. If you want ideal sand for Sarracenia, go to a building supply place and request Pool Filter sand; that is what I use.
2) Perlite contains fluoride, and it does leach out of the perlite over time, so it is best to limit how much perlite you include in a mix, just to err on the safe side of avoiding fluoride toxicity. IE: no more than 30% perlite by volume.
Otherwise, there is no reason to avoid using perlite, unless you simply cannot tolerate its physical properties because they offend your sensibilities. Oh, and about perlite dust: it is basically powdered glass, and is therefore capable of contributing to silicosis of the lungs if inhaled, so at least wet it before you handle it! I buy fairly large bags of it and the first thing I do is cut off the top of the bag and pour copious amounts of water into the bag (not before poking a couple of small drainage holes in the bottom), allow it to drain, and repeat once more. Never handle the stuff when its bone dry.