Dave Finkelnburg on mon 19 jun 06
Norma,
There's a lot of folklore on the subject, but I
personally use several dozen fully glazed planters
with no problems. I also use some that are unglazed
inside, and some that are totally unglazed. Frankly,
I don't think the plants really care much one way or
the other.
What does make a difference is the size of the
planter, whether it is large enough so the roots of
the plant do or don't get hot in the sun, for example.
Because I live in a climate that is warm, dry, and
sunny in the summer I often put heat-sensitive plants
in liner pots so there is an air gap between the liner
and planter.
No glaze on a porous planter does permit some
evaporative cooling of the planter. I'm not sure the
effect is great enough to make a huge difference.
Overwatering and underwatering are chronic
problems for people with potted plants. How a plant
is cared for is more important than how a planter is
glazed.
Good potting and planting,
Dave Finkelnburg
--- norma messing wrote:
> I am making some Cone 6 stoneware patio planters and
> would like to know -- from a horticultural rather
> than esthetic perspective -- whether I should glaze
> either the interior or exterior.
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Vince Pitelka on mon 19 jun 06
Norma wrote:
"I am making some Cone 6 stoneware patio planters and would like to know --
from a horticultural rather than esthetic perspective -- whether I should
glaze either the interior or exterior."
Planters work better if the inside is left unglazed - it gives a better
surface for the roots to interact with. The choice of whether or not to
glaze the outside is purely aesthetic, but don't plan on selling your
planters for much of a price if they are unglazed on the outside, unless
there is other decoration (carving, applique, slip-painting) that makes them
special.
Good luck -
- Vince
Vince Pitelka
Appalachian Center for Craft, Tennessee Technological University
Smithville TN 37166, 615/597-6801 x111
vpitelka@dtccom.net, wpitelka@tntech.edu
http://iweb.tntech.edu/wpitelka/
http://www.tntech.edu/craftcenter/
Fredrick Paget on mon 19 jun 06
>
>I am making some Cone 6 stoneware patio planters and would like to know =
>-- from a horticultural rather than esthetic perspective -- whether I =
>should glaze either the interior or exterior. =20
>Norma Messing
It doesn't make any difference from a horticultural point of view but
from a marketing point of view a lot of buyers seem to think that an
unglazed interior is good for the plants. Almost all nursery stock in
USA is grown in plastic pots, so go figure.
A nice glaze that is not taking attention away from the plant is the
ticket for the outside and over the rim and down an inch or so
--
From Fred &Nan Paget,
No Tengo Rancho,
Marin County,
California, USA
fredrick@well.com
norma messing on mon 19 jun 06
I sent the following question last week but haven't seen it posted? any =
problem??
Thanks,
Norma Messing
----- Original Message -----=20
From: norma messing=20
To: Clayart=20
Sent: Wednesday, June 14, 2006 9:10 PM
Subject: glazing outdoor planters
I am making some Cone 6 stoneware patio planters and would like to know =
-- from a horticultural rather than esthetic perspective -- whether I =
should glaze either the interior or exterior. =20
Thanks,
Norma Messing
PotLuck Pottery
Short Hills, NJ
Mark Issenberg on tue 20 jun 06
I spray my planters.. Glaze gets inside.. Some of my planters get dipped,
more glaze inside. In some of my new planters for succulents and Bonsai Im
glazeing the inside just because i like the way it looks. If some plant person
can really tell me why not to glaze the insides maybe i would not glaze them
inside..
I make lots of holes for drainage ,, i dont like to make a big hole that has
to be blocked with screen etc.
As some of my planters go through winters its interesting to see which ones
crack. Some of the Bonsai pots made from overseas are cracking, but my
planters that i made are holding up.
Mark on Lookout Mtn
Craig Clark on tue 20 jun 06
Norma, the only reason to go with a high fire stoneware for a
planter is for strength. Otherwise, the permeable wall of a good ole
fashioned earthenware pot is best. It permits the passage of moisture.
Less danger of root rot.
Having said this, if you go with a high fire stoneware I don't think
glazing makes any real difference beyond the esthetic one. The clay will
be vitrified, so there will be little or no migration of water, or
anything else for that matter. The only thing that I can think of that
the glazing will change, from a utilitarian stand point, which on
retrospect ain't horticultural, is for cleaning purposes.
Hope this helps
Craig Dunn CLark
619 East 11 1/2 St
Houston, Texas 77008
(713)861-2083
mudman@hal-pc.org
norma messing wrote:
>I sent the following question last week but haven't seen it posted? any problem??
>Thanks,
>Norma Messing
>----- Original Message -----
>From: norma messing
>To: Clayart
>Sent: Wednesday, June 14, 2006 9:10 PM
>Subject: glazing outdoor planters
>
>
>I am making some Cone 6 stoneware patio planters and would like to know -- from a horticultural rather than esthetic perspective -- whether I should glaze either the interior or exterior.
>
>Thanks,
>Norma Messing
>PotLuck Pottery
>Short Hills, NJ
>
>______________________________________________________________________________
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
>
>
>
nori on tue 20 jun 06
hi, everyone.
well, i know a LOT more about gardening than i do potting.... although
that might not be saying a lot.
but really.
i have around 70 containers in my garden every year... some perrenials,
some veggies, a lot of annuals. they sit on my asphalt driveway, the
concrete patio, on top of walls, etc.
and i very carefully match the type of planter to the plant. here are 2
ends of the spectrum...
i put geraniums in unglazed, terra cotta pots. and i put the pots up,
off the ground, using bricks... they need to have dry feet. they need a
LOT of drainage. that's why they always look so DAMNED good in neglected
places, like mall parking lots. they just don't do well for me in
stoneware or plastic.
then there are plants like coleus... mine like to DROWN in water. so no
way would they go in terracotta. i put them in glazed stoneware or
plastic. i put a single layer of newspaper over the drainage hole & use
moisture crystals to boot. and the pots sit in saucers filled with
water. and in upstate ny, i get coleus that are 3 feet tall... and
that's from tiny, cheap plants that come 6 for $1.29.
if the plants doesn't like to get dry, it doesn't matter one whit in my
experience whether the planter is glazed on the inside or not. i use
both, and plants do equally well. i've spent a lot of time with the
cornell cooperative extension folks, and i never remember this coming
up.... but if anyone has any citations on the subject, i'd love to see them!
some of my planters are gorgeous... and some are not.
i get a lot of containers from curb shopping. i especially like finding
big old ceramic containers, glazed inside & out... you know, the kind
that florists use for house plant arrangements....
i use my ceramic drill bit... put a hole in the bottom, then use & abuse
them. in fact, i LOVE putting plants in them that tend to take over
flower beds... goose neck loosetrife or mint... and they stay out on the
patio ALL winter... and come back just fine the next year. and the pot
is usually fine, too.
ok, enough garden blather from me.
sabra
--
Clifton, Norwich & Sabra
My pottery www.catclay.com
PEO International www.peointernational.org/about/
A little effort + no money = a big difference! www.samplesoap.org
Frances Howard on wed 21 jun 06
Hi Norma,
My planters are all cone 04 so perhaps this doesn't apply, but there is a
lot to be said for glazing them as this cuts down on evaporation. Unglazed
planters are lovely for the plants' roots in the rain but hard work for the
person watering them as on hot, windy days they dry out very
quickly,sometimes they are better sitting in a saucer of water to ensure the
pot and roots keep damp and cool. Think of unglazed wine coolers. I'd vote
for glazing, though the glaze will craze quite quickly and will probably
look a bit worn after a few years with all that water around. I think
adequate drainage is more important. I put three lumps ? of clay like
spools of thread on the bottom inside as people don't always want to plant
up but will sometimes just insert a plastic pot and these are better than
looking around for little stones,
and drainage holes on the sides , not the bottom, just below that level so
the pot can be used indoors more easily, but can be left outside in heavy
rain with no danger of drowning. Lug handles are essential I think as these
earthenware pots can get very heavy.
I'd glaze both interior and exterior for ease of cleaning too. You can use
all your mystery glazes inside. The plants won't care, and I don't think
any glazes would alter soil ph, though you'd have a winner if they could!
Frances Howard. Nova Scotia.
----- Original Message -----
From: "norma messing"
To:
Sent: Monday, June 19, 2006 12:10 PM
Subject: question on glazing outdoor planters
I sent the following question last week but haven't seen it posted? any
problem??
Thanks,
Norma Messing
----- Original Message -----
From: norma messing
To: Clayart
Sent: Wednesday, June 14, 2006 9:10 PM
Subject: glazing outdoor planters
I am making some Cone 6 stoneware patio planters and would like to know --
from a horticultural rather than esthetic perspective -- whether I should
glaze either the interior or exterior.
Thanks,
Norma Messing
PotLuck Pottery
Short Hills, NJ
______________________________________________________________________________
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
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