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PlantTherapy: Simple Plant Food, for Free

2008-04-13eggshells.jpg

Organic Gardening Magazine had great suggestions this month for using items in/around your home as plant food, rather than spending money or reaching for a chemical. Two of these seemed especially good for people living in the thick of the city (photo above is a big hint for one of them)...


The first is eggshells. Organic Gardening suggest drying the shells out on a baking pan using the lowest oven setting, then pulverizing them in a food processor.

This leaves you with powder that can be sprinkled around base of your houseplants. It is a great source of calcium (chicken eggs are 93 percent calcium carbonate), and also a great way to raise the pH levels if your soil is too acidic.

The second is coffee grounds. They will give your plants a 'jolt' of nitrogen, phosphorus and potassium and are perfect for plants that like acidic soil.

Both make use of ingredients that served their use to make a free, natural plant fertilizer. The idea of drying and pulverizing the eggshells would also make them easy to store and share.


photo by Kate Shepard via Flickr

matt at apartment therapy dot com

Comments (16)

When I took a gardening course, the teacher routinely suggested that we should all be throwing our used coffee grinds out onto the lawn. Increases the organic matter in the soil.

You can also dry the eggshells by just rinsing and putting them out in the sun. If you don't have a food processor, put them in a bag and bash them with a rolling pin.

posted by gremlin on 2008-04-13 09:52:11
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Lowering pH means making it more acidic. You might have wanted to say raising pH levels (=less acidic).

posted by pomuk on 2008-04-13 12:30:05
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Just saw that - thanks pomuk!

posted by mattplantguy on 2008-04-13 12:49:08
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These are great ideas! Though I do think it's a bit of defeating the purpose to use extra energy by using your oven to dry out the eggshells. The idea of leaving them in the sun to dry is a perfect solution!

posted by m! on 2008-04-13 13:26:32
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although, if you are going to add the eggshells to your plants, where you will be watering them, perhaps they don't need to be perfectly dry in the first place...

posted by eat more lemons on 2008-04-13 13:39:38
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It's easier to pulverize them into powder when they're dry. Otherwise, you get paste or chunks that don't do much other than just sit in your soil.

posted by J. Cipa on 2008-04-13 16:26:56
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You can also use the water left over from making hard boiled eggs, because the calcium from the shells leaches into the water. (Just don't forget to let the water cool down before putting it on your plants!)

posted by shereeDesign on 2008-04-13 17:00:27
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Here's another good tip for making herbal tea for your plants from yougrowgirl.com (although may be a little more labour intensive for apartment dwellers?)

http://www.yougrowgirl.com/thedirt/2006/05/08/plant-shall-eat-plant/

posted by shereeDesign on 2008-04-13 17:03:51
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We routinely sprinkle coffee grounds onto our houseplants, with good effect. But now that we have a little garden and are composting, I'm wondering: how many coffee grounds are too many? We drink so much coffee that I fear the plants might get a bit, er, jittery.

posted by Shannon on 2008-04-13 17:08:46
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Same here, we drink a LOT of coffee, and all the grounds go into the compost. How much is too much?

posted by Deidre88 on 2008-04-13 22:07:16
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Two more safer-than-chemical gardening tricks:
The chemical weed killer "Round up" is just a modern home-use version of Agent Orange. It's not safe, it's horrible for the home user and the water table, and really unneeded.
To kill weeds in the sidewalk cracks or lawn:
1- Boiling water. Just boil up a pot and go out and pour it on the weeds. It will kill them just fine and more safely (wear closed-toe shoes and pants when doing this- the hot water will spatter).
2- Beach sand. If you have a brick patio, do what my grandmother did. Go to the beach, take home a bucket of sand and sweep it into the weed-filled cracks, then water. The salt in the sand will kill off the weeds, and the sand will refill the spaces the weeds are growing through. Yes, there will be some salinization of the soil, so don't do this more than once a season. But it's less toxic than chemicals, and if you ever wish to pull up the stones, a good long soak will wash the salt away.
Also, to keep the weeds down, keep a jar of grass seed/mulch combo on hand to sprinkle on any bare spots left by weeding the lawn, and try a hardy low-growing ground cover (baby tear moss in shady areas, woolly thyme in sunny spots) to preempt weeds between stepping stones and less formal patio bricks.

posted by seam2stressed on 2008-04-14 01:45:41
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Also with the eggs, we often plant seedlings in eggshells to prep for planting in the ground. You have to break the egg nearer the top so you get a good-sized cup. When it's time to plant the plant in the ground, just break the shell off.

posted by hilaryb on 2008-04-14 04:35:40
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My grandmother used to put eggshells in her watering can. When I was a little kid, I used to think it was funny ... now I know why!

posted by Jane on 2008-04-14 10:21:56
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I'm also curious about the coffee grounds--should I ask one of the local Starbucks to save grounds (they will) or will it just be too much for the plants?

Also this weekend, I followed in the footsteps of a friend and collected dry bat guano from underneath the bridge of our dry riverbed. Not smelly until you make it into a tea for the plants! Easy and free!

posted by jen_g on 2008-04-14 14:14:48
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Wow - bat guano!

The question of 'how much is too much' is a good one. How about this - I will see if I can get a good answer for everyone, and if I do I'll post it next week.

Even though we get a huge caffeine jolt from coffee, I have been told it is fairly weak as a plant fertilizer. I don't think you have to worry too much about your plants getting the jitters :)

I also read somewhere that although raw beans have a high acid level, that they become closer to neutral in pH once they are brewed - same with composted grounds. And if you have worms in your garden they will also help in breaking down your grounds and lowering their level of acidity.

So far I haven't had outside plants complain with the 1/3" - 1/2" layer I will put down. But results will always vary I'm sure depending on the plant and preexisting soil conditions.

Stay tuned ~

posted by mattplantguy on 2008-04-14 15:53:11
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Coffee grounds are also a great way to keep cats out of your flower beds!!

posted by lb1 on 2008-04-14 18:20:39
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