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Planting Subway Grates: Step by Step Instruction

Planting Subway Grates: Step by Step Instruction
The premise of this project is to start a conversation about the potential for plants to filter the air flow from underground networks that exist in our cities. The spaces in between subway tunnels and the sidewalk/street surface can be metaphorically perceived as membranes within our city, and some would argue that they are under-utilized. This particular experiment is situated in New York City.


 
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Step 1Materials for Prototype

Materials for Prototype
These are the materials needed for the following how-to guide.
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32 comments
Nov 30, 2011. 1:29 PMGrissini says:
really cool. Was there a particular reason for your choice of plant? What sort of conditions are said plants going to experience?
Dec 4, 2011. 5:32 PMFlyinseamnky says:
As someone else pointed out, I am sure subway maintenance loves this. The point of the most grates is for storm water run off. If that plant does manage to live and grow it will block or at least restrict the water flow. Not being an expert, but having worked at a Civil engineering firm as a drafter I can tell you that drainage systems are usually designed/calculated to handle certain amounts of drainage per the amount of ground above/ between them. Now granted trash does fall in them but it does not grow larger than the grate they have fallen through. Nor does most trash take root, clinging to the small cracks in the concrete therefor can usually be flushed away in the case of heavy rain. When it comes to urban design most things are done for a reason. An empty lot is one thing, but when messing with potentially safety issues please check with your city first. I would hate to see someone get a ticket or fine over this instructable, or worse.
Dec 5, 2011. 11:31 AMAmyLuthien says:
All that Flyinseamnky said, and any plant chucked down a storm drain, subway grate etc. will eventually get removed with the rest of the trash that finds it's way down there.

Spider plants and Pothos (which is a genus of plants, not 'pathos' which in an emotion) are tropical plants, they would never survive the winter.  But if they did somehow manage to survive, and they were looked over by the cleaning crew, then there are pests and diseases to worry about -  subway grates and storm drains are not exactly noted for being clean, healthy places.  So not only is the plant exposed to pests and diseases, but it also becomes a carrier for these things, spreading to other plants nearby.

Bottom line, there are much better places to put plants, and they'll still filter the air, only much more effectively since they are both alive and disease free.


Dec 5, 2011. 8:15 AMcrapier says:
Okay, so the conversation: What evidence do you have that a small amount of biomatter will act as an effective filtration system in subway ventilation systems? How would this compare to a more traditional carbon or even HEPA filter? What are you trying to filter using these plants? Heavy metals? Benzenes? Formaldehyde? Small particulates? CO2? I know people have experimented with this concept before and the results have not been supportive - most of these tests were in indoor settings with more sedate airflow that the massive blasts you get from subway trains. So it's an interesting concept and probably looks pretty neat but do you have any evidence to support the air cleaning capabilities? Especially any evidence that refutes the studies under taken in the late 80s? Please note: I'm not saying that the idea has no merit but it may be impractical as a filtration system in high volume/velocity situations as envisioned. I think it may have a lot more merit as a way to introduce more green 'spaces' in crowded cities.
Dec 4, 2011. 7:48 AMstumpster says:
Pathos will grow most anywhere... even in a closet, if you open the door once in a while. DON'T throw Kudzu down there!!! it might end up eating the commuters!
Dec 5, 2011. 3:41 AMMadrigorne says:
I agree Pathos will grow happily in warm, moist, shady conditions. If you build in a 'break point' on the rope used to hold the plant in place, it will let go the plant once it is too large/heavy or if the waterflow drag coefficient becomes too great, or if the rope itself degrades enough; then the plant becomes so much debris that will wash away.
Dec 4, 2011. 4:22 PMstumpster says:
Yes, I've ridden those rails enough years to know how we are, but I also spent a couple of years in the southeast, and have seen what kudzu can do to a whole forest!!
Dec 4, 2011. 6:36 AMsitearm says:
@GreatestGrates; Hi! This reminds me of the other Instructable to put self-contained plant grenades in empty lots. Just add rain. My curiosity is totally hooked at the idea of "planting plant bombs to go green." Is there a risk of clogging rather than filtering air flow?

Cheers! :)
Site
Dec 4, 2011. 5:36 PMFlyinseamnky says:
http://www.instructables.com/id/Seed-Grenade/
Dec 5, 2011. 3:35 AMsitearm says:
@Flyinseamnky; Yikes, another one! cool! :) Site
Dec 4, 2011. 11:26 PME.Coli says:
Very neat Idea!
I live in Seoul and I want some of em near my apartment. lol
Dec 4, 2011. 12:11 PMDeeAnn says:
Fantastic. Love it. Once you've learned if the spider plants will survive, round two should consider perennial edibles that can provide food--urban permaculture.

Be very, very careful about your plant choices.
Dec 4, 2011. 6:47 PMkgillogly says:
I'd be careful about edible plants, as many heavy metals (which would get into the air from the exhaust of the trains, the creosote and other chemicals on the rails, etc.) can be taken up by plants - so if you eat the plants, you could get dangerously high levels of heavy metals. Think of the plants merely as air purifiers. That does us lots and lots of good as well, right?
Dec 4, 2011. 7:18 PMDeeAnn says:
yes, yes, good one
Dec 4, 2011. 2:30 PMDickerson888 says:
I was wondering exactly how legal this is. Might be better to work with the subway people to access the area and place plants in pots. I know in Memphis this summer a fellow received a grant to plant wild flowers in the city owned vacant lots.

The city for insurance reasons couldn't allow the guy access to the lots so the fellow made seed bombs and used an air compressor powered mortar.

This spring we will have flowers everywhere.

Dec 4, 2011. 10:10 AMemerson.john says:
I celebrate what you want to achieve, but in the end it just looks like a cruel, complicated way to kill a little plant.
Dec 4, 2011. 6:58 AMjuz4kix says:
The maintenance people are going to love you. Have you checked that this was OK? You could potentially be adding debris to the system that cannot be handled.
Dec 4, 2011. 9:54 AMdihnen says:
There is nothing that cannot be handled.
Dec 4, 2011. 9:43 AMporcupinemamma says:
Very cool. Nice addition to "Gorilla Gardening" movement. Hopefully unloved public places will sprout lots of crocuses this spring in my neighbourhood ;0)
Dec 4, 2011. 7:44 AMmojojojofilmmaker says:
I like your idea very much. congrats on that!

But I have a question. Can you do this with other type of plant? this plants tend to accumulate water between its leaves, that makes a perfect mosquito-growing pool.
Nov 30, 2011. 9:36 AMrandofo says:
Nice project. Let me guess... Parsons or NYU?
Dec 1, 2011. 9:03 AMrandofo says:
I did my undergrad in DT. I still have this innate sense for spotting projects from there...

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