Instructables

Cheap, Easy, Leak-Safe Way to Water Plants While On Vacation

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My husband and I like to take trips to exotic locales, but we also like the jungle-like explosion of houseplants we have in our apartment. This combination poses a problem, because there's only so many times you can impose on a friend to water your apartment-jungle, even when bribing them with lovely souvenirs from exotic locales.

Also, the sheer number of plants we own made commercial solutions too expensive. I considered building a system with tubing, but my husband worried that it might spring a leak while no one was home.

So I came up with the following dirt-cheap, easy, and fairly leak-proof solution: You just need resealable plastic bag full of water with a wick in it to pull the water out at steady rate.

This Instructable will show you how to do that, but all you really need to know is that the size of the needle you use to thread the wick determines how fast the water drains out of the bag.

Caveat: Not all plants will be happy with this method of watering, which keeps the soil continuously damp. Ivy, for example, likes to dry out before being re-watered.

 
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Step 1: What you'll need:

You'll need:

1) Thread. Most types will work, but cotton thread is probably best for wicking purposes. If you're going away for a very long time, polyester might be better to ensure the thread doesn't rot.

2) Scissors for snipping thread.

3) Re-sealable plastic bags. The size depends on how large a reservoir of water you need, which will depend on how much water you want to deliver to the plant every day, and for how many days.

4) A very fine needle. The ideal is probably a #10 needle, which is about 0.5mm = 0.02" thick. However, any needle in the #8 - #12 range should work fine.

NOTE: A "regular" needle is usually about a #6 and TOO LARGE. The size of the needle is what determines how fast the water will drain, so you must find a very thin one. It's easy to add more threads to one bag to increase the drainage rate, or to add several small bags to one plant's pot, but you can't throttle the water flow from a hole that is too large.
PetrinaC14 hours ago

Is it possible to do this without the wick? I ask mainly because I don't want to have to go get a finer needle. If I don't need to get the thread through, I could just prick a small hole in the bag with the tip of the needle? Thanks!

jjdebenedictis (author)  PetrinaC7 hours ago

Unfortunately not; the drainage rate becomes really inconsistent without the wick to hold the hole open.

Try testing just one baggie with one hole in it using the needle you've got. and maybe some thicker thread. You might find the flow rate is okay for your purposes. Good luck!

Wragie1 year ago
I like this!

This would be very handy just to turn a daily chore into a once a week chore too.
Most plants only need to be watered once a week anyway unless you are watering them only a tiny bit each day (like this method). We live in a very dry climate and a good watering once a week is what most plants are happy with.
I love having green plants indoors but don't have much luck with them. I have had success with mother-in-laws tongue (not sure that's the right name) and elephant plants (again not sure) and they have thrived from my tender mis-care. Would be nice to figure out what I need to do so I can can start calling them plants instead of compost.

However some of the hardier varieties of green plastic ones seem to be non killable....so far. ;-]
zdarovia1 year ago
Brilliant idea! I'm sometimes away for 12 weeks and don't want to bother my neighbor. But if I ask them to pop in once a week and top up the bag when she sorts out my mail, it wont be too much to ask. Especially if I bring her some goodies back.
openroad1 year ago
Thanks for a solution that seems so simple but yet I have not seen. Great job on a project that is both efficient and cost very little. So much better than plastic bottles.
We used to have a ficus tree--7 foot tall or so. When we went on vacation we would fill one of those bladders which come in the box-o-wine. Some have a "faucet" type spigots- those are the ones I prefer. I just turn the spigot on very slowly. We are usually gone 3 weeks at a time. No problem with mold. Also use these water-ers in the early planting season to water each individual plant. Hope this helps someone.
jjdebenedictis (author)  retirednurse1 year ago
Good suggestion! Before coming up with this idea, I had been thinking about IV drip bags, but couldn't find anywhere to buy them cheaply. The box-o-wine bladder would work very nicely.
So, what is the longest you were away for this to do it's job? (days? a week?)

cheers,
jjdebenedictis (author)  jakerobinson1 year ago
About ten days, but there was still water in most of the bags when we got back. I'm convinced this could work for three weeks easily, and possibly longer if you used large bags and calibrated their drainage rate carefully.
Thanks for that... that is impressive. good 'ible... cheers,
a h mehta1 year ago
Its a very good idea. In case the hole has become bigger or accidentally the needle pierces at wrong place on the bag, may be you can seal it with a cello tape and then pierce the hole to the size required.
kdomjan1 year ago
Simplicity = beauty
a.steidl1 year ago
Neat idea. As a suggestion, though, I'd recommend dark bags, to avoid algea growth in the light.
jjdebenedictis (author)  a.steidl1 year ago
Good suggestion! We didn't have any trouble with algae in the bags, but the threads did turn black and slimy (after 10 days), so I suspect we eventually would have.
I do the same thing outside using 10 gallon trash bags for my fruit trees. I just tie them to a rebar to hold them up and fill them with water. The hole I have on the bottom leaks out and keeps the soil moist. I didn't want to spend money buying the green bag watering systems for trees you might see around parks.
jjdebenedictis (author)  Money_Illusion1 year ago
Great way to scale the idea up! Thanks for mentioning this!
jgeidl1 year ago
How large are the plants you are watering? Size would control how many/how big a bag you use, I would think.
jjdebenedictis (author)  jgeidl1 year ago
The orchid in the first shot is the largest plant we watered this way, although it's not our thirstiest. I'm not sure this would work for, for example, an indoor tree. However, Money_Illusion's comment down-thread is a great way to scale the idea up.
rfhewitt1 year ago
Great! Thanks!
Absolutely genius. I just wish you had shard this a month ago. Could have used it then :)
tdc22021 year ago
What a great idea! I love your clear instructions, too.
wtrattles1 year ago
Great idea!
if you were to turn the bag over so the wick hole was not in the water you could freeze the bag and as the ice melted it would water the soil over a longer period of time depending on how hot the house is inside ...
keep in mind ICE is cold and some plants don't like cold ;)
Hey! Cool! I need this for everyday. (I keep forgetting to water.)
jjdebenedictis (author)  Tracy_Marie1 year ago
:D I have considered using it for everyday too!
dkistner1 year ago
This is a majorly awesome instructable! What a nice job you did. People and plants everywhere love you!
MaryBens1 year ago
This is so clever! Some years ago, I tried several experiments to attempt to use wicking to water outdoor plants, but they all failed (the rope wouldn't wick). I had given up on the idea, but now you have inspired me to try again. Thanks for posting this. Good photos, clear instructions, excellent hints to avoid failure.
EET19821 year ago
That's awesome! Great job!
You just invented a DIY drip irrigation system :). Thank you so much for sharing.
Cool!
So smart! Next time I go somewhere I won't accidentally kill a plant. :D
rimar20001 year ago
Interesting method. How many days (approx) you can leave it?
jjdebenedictis (author)  rimar20001 year ago
Sorry, Rimar2000; I thought I replied to this a few days ago, but I guess it didn't "take" (I'm new.)

My last trip was 10 days, and the bags weren't empty when we got home, but the plants were fine, so I know it lasts that long. I think you could easily go 3 weeks using this method of watering, and possibly up to two months, provided you carefully calibrated your drip rate and chose large enough bags.

Thanks for your comment!