Tag Archives: water

DIY olla planter for swamp milkweed

In my futile quest to attract monarch butterflies to my yard, I recently planted swamp milkweed (Asclepias incarnata).  There are other kinds of milkweed (e.g., the orange-flowered A. tuberosa, butterfly weed) that you can plant here (Zone 7A), but adult monarchs really like the flowers of A. incarnata and the larvae really, really like its leaves.  The problem is the plant likes to be consistently watered, which is hard if you leave the house for a few days in the summer.  So I decided to plant a few plugs into a large pot equipped with a makeshift olla.  Ollas are those beautiful, unglazed terracotta containers used around the world to irrigate crops without much water waste: you bury them next to your plant, fill them with water, and then they slowly release moisture into the surrounding soil.

Anyway, photographs of what’s in my garden are probably TMI, but I wanted to share so that others might be guilted into planting some swamp milkweed, too.  If more people maintained host plants, more monarchs will come … and who wouldn’t want that??

If you’re on board, make yourself an olla with a terracotta pot glued to a saucer.  Or use two pots together — just ensure that you’ve got something watertight. I’m fond of Loctite Premium and Gorilla Glue for getting the components sealed together.  Note that you must use unglazed pots. To facilitate filling of the olla, attach something funnel-like.  For this olla I used a lamp reflector bowl that I found on sale at a hardware store; because I needed a little more height, I attached the funnel on top of a little bit of PVC tubing.

Colin Purrington Photography: gardening &emdash; terracotta-olla-with-glass-funnelNext, equip a planter with a plastic liner so that water will pool a bit at the bottom.  Alternatively, if your planter is wood or plastic and lacks holes at the bottom, just drill a few drainage holes midway up the sides.

Colin Purrington Photography: gardening &emdash; planter-with-plastic-liningHere’s a photograph showing the olla inside the planter.

Colin Purrington Photography: gardening &emdash; olla-with-glass-funnelHere’s a really boring video of water being added to the olla.  But I sped it up so you don’t suffer too long.  But you can skip this and I won’t be offended … I’ve just found that when explaining the olla concept to the uninitiated, they don’t get it unless showed.

Once filled, you can see the porous nature of terracotta almost immediately.  I think this pot is particularly porous (perhaps firing temperature was too low).

Colin Purrington Photography: gardening &emdash; water-seepage-ollaAdd some sort of floating ball to your funnel so that when the water level goes down, the ball acts as a stopper for the olla, preventing evaporation. Other people have caps for their ollas — that works, too.  I’ve never seen balls used before, and they amuse me.  Yes, I’m easily amused.  Also gives me a quick visual for when the funnel level has dropped.

Colin Purrington Photography: gardening &emdash; ping-pong-ball-olla-capAfter you’ve confirmed that olla doesn’t leak from the glued seams, add soil and plants. Of course, if your olla leaks, dry it out and add glue or caulk (the white stuff you see at the bottom).

Colin Purrington Photography: gardening &emdash; swamp-milkweed-in-olla-planterThis shows how the ball (ping pong ball) seals the neck.  Works like a charm.

Colin Purrington Photography: gardening &emdash; ping-pong-ball-olla-cap-sealedNow I’m waiting for the darn monarchs.  I hate this part.

By the way, ollas work well for any plant.  I have about 10 in my garden, all homemade (you can buy fancy ones, but shipping terracotta is expensive).  Really great if you find yourself traveling during the summer, or have plants that don’t tolerate even a single day of neglect.  If you hook them up to rain barrels via a siphon (future post), you can have pots that water themselves entirely.

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Mantoloking before Hurricane Sandy

The house is gone.  All we have now are photographs.  Sadness.

Mantoloking sunrise with sailboat

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Indestructible water molecules?

When you’re chaperoning a school trip, you notice things.  Annoying things.  Shown below is a sign at Philadelphia’s Fairmount Water Works Interpretive Center that makes the claim that all the water molecules on Earth are never, ever destroyed — they are immortal entities. If you teach biology, you’ll be instantly outraged, especially when you think of the hundreds of thousands (millions?) of kids who’ve absorbed the contents of this signage as fact.  Details below the image, but see if you can figure out the flaw before you jump.

photosynthesis, water, split, molecule, science, biology, signage, error

The sign is wrong partly because of photosynthesis, which usually involves the splitting of water molecules (to generated electrons).  That little trick evolved about 3,500,000,000 years ago, so I’d wager that most if not all the water originally present on the planet has been replaced by new molecules produced from combustion (including respiration). That’s just a guess, though…I couldn’t find a calculation on the internet.  Download this photograph and use in your lectures to introduce the ideas of photosynthesis and respiration.  If you lecture on science center signage, you can use this to highlight the value of getting a few scientists to proof the graphics.  Or a few 7th graders.

Posted in Biology, Graphic design, Science | Tagged , , , | 1 Comment