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

725,900

399

63

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.

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.

Step 2: What You'll Need to Think About in Advance:

If you've got a bit of time to plan ahead and experiment, the following are some good things to think about to ensure your plants are going to be happy while you're away.

1) How much water does each of your plants need?

What you want to determine is how much water you want draining into the plant per day. The way to work this out is to think about how much water you normally give that plant and how often.

For example if you usually give your plant two cups of water once a week, then you want your bag to deliver (2 cups / 7 days) ~ 0.29 cups of water to the plant every day.

2) How large a plastic bag are you going to need to hold enough water to last your entire trip?

For example, if your plant needs 0.29 cups of water per day, and you're going to be gone for 20 days, then you want a bag that will hold (0.29 cups per day) x (20 days) = 5.8 cups of water.

On our last trip, I only used "snack" and "medium" sized Ziploc bags, so I can give you the water volume of those:

- "Snack" sized Ziploc bags (4" x 6.5"): 1 cup of water
- "Medium" sized Ziploc bags (7" x 9"): slightly less than 6 cups of water

3) How fast are your bags actually draining?

Obviously you're going to need to actually create a bag to determine this, but you should test how much water drains out of the bag over a given time period. This will depend on the size of needle you use.

To test your drainage rate, create a bag with one wick, then fill it with water and prop it on the top of a measuring cup with the wick pointing downward. Wait an hour, then see how much water has dripped into the cup. Multiply this by 24 hours to find out how much water the bag will deliver in one day.

If it isn't enough, then you can add more wicks to the bag. As long as you use the same needle, you can double, triple, etc., the flow rate in a very consistent manner.

Step 3: Preparing Your Water-wick

Cut about a 20 cm (8") length of thread, and thread your needle.

Tie the two ends of the thread together with a fairly large knot (i.e. knot it two or three times in the same location.) The bag's plastic is quite soft, and small knots sometimes slip right through the hole that the needle makes.

Step 4: Adding the Wick to the Water Reservoir

The thread is going to act as a wick to draw water out of the bag through the hole made by the needle.

Note that the thread is NOT optional; the flow rate of the water becomes very inconsistent if you don't have a wick holding the hole open.

I like to put the wick near the bottom of the bag, centred, but also going through one of the flat sides of the bag. That way, I can lie the wick directly against the plant's soil when the bag is full of water.

It's important you don't poke extra holes in the bag by accident as you're moving the needle down to the bottom, so I recommend pressing the tip of the needle flat against your finger (as shown in the first photo) before moving your hand into the bag.

Once you get the needle to the place where you want to place the wick, push the needle through the bag, then snip the thread.

And that's it! You're ready to use the bag.

Step 5: Preparing to Use the Magical Plant-watering Leaky Baggie

I find it easiest to fill the bag up in a full sink or bucket.

Hold the bag open and dip it into the water, then lift it slightly to let gravity fill it. To get the maximum amount of water into the bag, I find it's easiest to seal it with the bag still mostly underwater.

Step 6:

As soon as you lift the bag out of the water, water will start wicking out of the needle-hole and dripping down the thread. This is what's going to water your plant!

Because the bag is now actively leaking, transfer it into a pan or bowl so you can take it to your plant without dripping on the floor.

Step 7: Water Your Plants!

Place the bag in the plant's pot with the wick touching the soil. The water will drain at a continuous rate into the soil, with the bag deflating slowly in the process.

If you need to deliver more water to a particular plant, you can either add more wicks to one bag, or add more bags to that plant's pot.

Large bags may need to be propped up via kebab skewers or chopsticks to ensure the bag doesn't flop over the edge of the pot as it deflates, isolating some of the water in a pocket that can't drain.

When you get home from your trip, empty the bags, let them dry out, then roll them up and store them for your next vacation. They take up very little space.

Bon Voyage!

Share

    Recommendations

    • Puzzle Challenge

      Puzzle Challenge
    • Optics Contest

      Optics Contest
    • Big and Small Contest

      Big and Small Contest

    63 Discussions

    0
    None
    MarkP370

    9 months ago

    This is a great idea. Wondering if anyone has a shortcut idea for me. I have many seedlings in 2x2 pots on 12 x24 trays, but I can't think of a way to get water to each pot without doing dozens of small bags (one for each 2x2 pot). These are small individual plastic square pots not the typical flats used in greenhouses for annuals. These are cyclamen seedlings as well which do not like to be too damp. Thanks so much for any suggestions.

    0
    None
    MarkP370

    Question 9 months ago on Step 7

    This is a great idea. Wondering if anyone has a shortcut idea for me. I have many seedlings in 2x2 pots on 12 x24 trays, but I can't think of a way to get water to each pot without doing dozens of small bags (one for each 2x2 pot). These are small individual plastic square pots not the typical flats used in greenhouses for annuals. These are cyclamen seedlings as well which do not like to be too damp. Thanks so much for any suggestions.

    0
    None
    Pegs11

    1 year ago

    I saw a picture today of a nurse who rigged up a bunch of empty water bottles with IV drip line coming down from them to the plant pots and she had whatever clip an IV uses that controls the drip rate. A great hack for medical equipment and growing plants, and pretty secure, plus sizable reservoir!

    1 reply
    0
    None
    jjdebenedictisPegs11

    Reply 11 months ago

    That was my original idea too, before I decided to use baggies; after all, why re-engineer something that already exists? :) However, I didn't know where to buy medical equipment and I had a tight time-frame until my trip, so I jury-rigged these instead.

    I just finished using them for another trip, in fact, and they still work well-although-not-perfectly. I wouldn't mind trying an IV for my next trip!

    0
    None
    MichT3

    1 year ago

    I followed these instructions quite carefully (no 10 needle, cotton thread, etc.), but the water doesn't seem to be draining out. It's as if the hole was too small. Any ideas?

    2 replies
    0
    None
    Pegs11MichT3

    Reply 1 year ago

    It's possible that you had an air bubble in your baggie that prevented the thread from sucking the water out. You have to either completely fill the baggie under water and seal it, or squeeze all the air out of the bag before the last bit is sealed. The thread should be the only "leak' in the bag - no air.

    0
    None
    jjdebenedictisMichT3

    Reply 1 year ago

    Other than trying a larger needle, not really. Sorry it isn't working for you! {:-/

    0
    None
    MarkM26

    2 years ago

    Great idea! I wonder if this could work with a pierced plastic bottle. I will try that out as well.

    2 replies
    0
    None
    gkelly5MarkM26

    Reply 2 years ago

    How would you get the needle to pierce a hole from the inside if you use a rigid plastic bottle?

    0
    None
    AshwinN14

    2 years ago

    on a 10 day vaccation this diwali..just what i was looking ..great thanks

    0
    None
    EwaR1

    2 years ago

    I really like that idea! You have a photo of an orchid - did you try watering it this way? Thx

    1 reply
    0
    None
    jjdebenedictisEwaR1

    Reply 2 years ago

    Yes, I have watered it this way! (Although not while it's in bloom.)

    0
    None
    Cshinn23

    2 years ago

    do you hang the bag so that Gravity is involved in addition to wicking?

    1 reply
    0
    None
    jjdebenedictisCshinn23

    Reply 2 years ago

    No, I just set the bag on the soil with the threads touching the soil. If it's a large bag, I prop it up with skewers or chopsticks.

    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!