Conserve water and grow healthy vegetables with a DIY self watering planter system. With easy-to-find materials and one afternoon you can be on your way!
Do you struggle with home-grown vegetables?
I hate to admit it, but we do.
For the last few years, we’ve tried planting various herbs and vegetables around our backyard and deck, but most times our plants die a miserable death.
Well, there was that one year we had a gigantic cucumber plant, thanks to DIY drip irrigation, but what about those years when you just don’t have the time to install something of that magnitude?
That’s why I was intrigued when I saw the idea of a DIY self watering planter.
How Does a DIY Self Watering Planter Work?
The general idea is that you have a pot with a built-in water reservoir for your plant. A single pot of soil (the wicking pot) sits down in this water reservoir to help suck water up (or wick water) for the plants in the soil above.
The planter is created to fill up with rain water in addition to hose water through a pipe system. Talk about water efficient!
This way, you don’t have to worry about watering your plant every single day.
How long does it take to make a DIY Self Watering Planter
I did lots of research before committing to the process. And I’m so glad I did.
Plus, I figured out a way to use my craft supplies to make the process go a bit faster…yay!
Even with taking phone calls from the husband, and stopping to take photos, each planter took about an hour and a half to make.
How to Make a DIY Self Watering Planter
- Rubbermaid Roughneck Tote with lid (I used 18 gallon tubs)
- Box cutter with a sharp blade*
- Hot glue gun
- 3/4-inch diameter PVC Pipe cut about 12 inches taller than the tote
- An old plant pot
- 4-6 Supports equal in height to the plant pot**
- Sharpie marker
- Tin snips
- zip ties (optional)
*It’s important that your blade be sharp. My first attempt at making these was with an old blade, and it not only took forever, but left a fairly mangled cut. Cutting the tote with a fresh blade was far easier.
**Make sure your supports are sturdy enough to hold up the weight of the soil and the plants when they are wet from a rain storm. Some people use PVC cuts, you could also use old water bottles (make sure they’re thick enough to be sturdy. I found that Frappuccino sized bottles and pickle jars are quite sturdy!
Cut the Lid to Fit inside the tote.
- Prepare your work surface with a piece of cardboard box or something you don’t mind getting cut.
- Following the inner lip on the lid, use the box cutter to cut the edge off the lid.
- Place the plant pot inside the tub and put the lid on top to see if the inner cut of the lid is snug, but not too tight.
- Repeat if necessary.
Tip: For the tubs I used, the inner lip was curved along the handles, but I ended up needing to make straight cuts on the sides.
Create a Moisture Wick
In order for the plant to stay hydrated, they will need to have a portion of soil that sits in the water reservoir. From there the water is wicked up to the plant as needed.
- Take an empty plant pot (the disposable ones that plants come in from the store), and trace the outline of the pot in the center of the inner lid.
- Use a box cutter to cut a circle that is a quarter to a half inch inside the line you drew. (This ensures that the pot can also be used as a support)
Make the Watering Spout
- Cut a hole in the corner of the inner lid that is about the same size as the PVC pipe.
- Using tin snips, cut a large opening in the bottom of the PVC pipe for water to drain out as you fill it from the top. Make your opening at least half the diameter of the PVC pipe and about two inches tall.
Note: this tutorial shows two PVC pipe spouts. I didn’t make the bottom hole big enough for my first tub, and was worried that it was due to the diameter of the PVC. With the wide bottom, I don’t need that second spout at all.
Create Drainage for Rain
If you live in an area that gets a decent amount of rain, then you’ll need to make sure that the soil can drain excess water into the reservoir. Most tutorials I read/watched mentioned that this was the longest and most tedious part of the process. It was made simple for me with my ancient glue gun! Here’s how:
- Remove any glue that is in the plunger of your glue gun and heat the glue gun as high as you can get it.
- Using the hot tip of the glue gun, create holes all around the lid of the tote to allow rainwater to drain into the tub’s reservoir.
- Repeat the process with the wicking pot and any plastic supports you have for the inner lid.
- Occasionally and carefully remove any plastic build-up from the tip of the glue gun.
Note: If you are using glass items like leftover pickle or Frappuccino jars, place them upside down so rainwater doesn’t get trapped inside them.
Create OverFlow Holes
In order to make sure you can see when your water reservoir is filled, you will want overflow holes that for extra water to come out.
- Use your supports/wicking pot to mark the inside of the tub where the lid will be resting.f
- Using a hot glue gun, make one or two holes about a half inch below the marked line on the side of the tub.
Now, when you fill the reservoir through the PVC pipe, watch for water coming out of the overflow. Similarly, if you think that the reservoir is too full, you can tip the tub and use the overflow holes to empty it out a bit.
Assemble the Box
Time to pull it all together!
- Using your hot glue gun, create holes in the corner(s) of the tote to thread the tips ties around the PVC watering tube.
- Place the wicking pot in the center of the tub.
- Put the supports around the tub to help hold the weight of the plant and soil (recommend at least 4-6 supports, depending on how wide they are.)
- Place the lid on top of the pot and supports, adjusting the wicking pot to make sure it is centered in the hold you previously cut out of the lid.
- Insert the PVC pipe(s) into the prepared corner(s) and secure with zip ties.
Fill the Planter and Get Started!
- Starting inside the wicking pot, add soil and place your plant.
- Add up to two plants per planter and fill with water using the watering spout.
Our Plants in Action
The cucumber plant (above) was pretty pathetic when it was first placed in the planter, two weeks prior to the photos being taken. It looks so much healthier now and I love seeing the new growth!
These are our tomato plants. Like the cucumber, they were pretty ratty when we first planted them about a month ago. But they’re thriving now…so much so that you can hardly see the watering pipe through the leaves…but it’s there!
Since we’ve had a fairly wet spring, I’ve only had to fill each of these planters once. They both hold several gallons of water, and I love the fact that they’re nearly maintenance free.
Bonus Tip: An Easy Trellis
Obviously, we can’t use traditional tomato cages with these planters, but our plants won’t continue to thrive without some sort of support.
We solved this by creating a simple string trellis!
All you will need are three 4-ft tall wooden stakes, and plenty of natural jute twine.
Bury your stakes in the ground next to your planter so they are nice and sturdy. Then string rows of twine about 6-inches apart up to the top of the stakes.
As your plants grow, tie the branches loosely to the twine rows to help support the branches and fruit.
Update: 3 Years Later
We used (and abused) our DIY self watering planter for two summers, and they were fantastic both years.
Unfortunately, due to our lack of care (ie. leaving them empty outside during winter), they cracked and broke last year. I know the DIY self watering planter would have lasted much longer had we properly emptied them each fall and stored them in our garage.
The husband still prefers drip irrigation, but I think that the self watering planters are the perfect option for growing vegetables on a porch or patio, or if you just want to stick to container gardening altogether.
Seriously, I plan on making new ones as soon as I can!
Now, It’s Your Turn
Stop struggling to keep your vegetable garden alive this year. Grab your printable instructions, and make yourself a DIY self watering planter or two this weekend!
What plants will you put in a DIY self watering planter?
Do you have any other tips for keeping vegetable plants healthy?