So for those who don't have much garden area having your own garden might be a matter of finding whatever you can to put some potting mix into and growing out of that, pots, tubs, barrels etc. You can also buy those self-watering plastic pots from gardening stores, they are generally expensive for the amount of growing area you get, and in my experience after a couple of summers they can get brittle and break.
So this year I have decided to make my own and I am going to share with you how I have done this. There are a few designs for this on the internet, but I wasn't happy with any so I decided to create my own. The concept is pretty simple you get a container, you use the lid as a support structure for the growing media which is fixed above the bottom of the container, except for one section which is used to wick the water up into the growing media. And now for the step by step construction plans.
Step 1 - First off you will need 2 containers, I went to Bunnings and got this 71 litre made in Australia for $15.99 and the smaller rectangle pot for $1.
Step 2 - Get your tools together; you will need a marker, ruler, file, sand paper, cutting blade, drill and hot glue gun.
Step 3 - Cut the edges off the container lid, knowing exactly where to cut will depend on the container you are using but you will need to leave enough of the lid so it fits snuggly when placed inside the container. For this container it was just a matter of keeping the top piece of lid and everything below was removed. I also cut the top off the pot, the height of this will determine how deep your water reservoir is I made it 9cm. Smooth the edges using either your file or sandpaper to get it to just the right size.
Step 4 - In the middle of the lid trace an outline of your smaller pot (the open-ended piece) around the main container lid. Using your knife and ruler score along these lines until the piece is ready to break away, note it is ok to make the hole smaller but don't go bigger, I found the lid more brittle so don't rush this step. Next drill holes in your pot, this will allow the water to seep into the growing media. And finally using your hot glue gun, glue the pot onto your lid. I used hot glue as it is non-toxic, I am not sure how it will go being wet but check back in 6 months for an update.
Step 5 - Put your lid with attached pot inside the main container, you can see here how the growing media will be inside the pot with water all around. If the sides of the lid seem a little big just remember that when you put growing media on top they will sink down. Finally cut a hole in the corner of the main container for watering using your blade, the height of this hole will depend on the height of your water reservoir, but I thought my corners weren't going to sink all the way down so I made the top of the hole at 10cm from the bottom of the container, and it was 2cm X 2cm.
Step 6 - Add your growing media, I added 50 litres of potting mix, the watering hole had a 1.5cm gap above it to the lid which was perfect, the lid can't be below the hole otherwise when you go to put water in your growing media and lid will be in the way.
So that's it, for $17 I have myself a self-watering container which can hold 50 litres of potting mix, a comparable sized one at Bunnings was over $40. Admittedly the self-watering component may not get a good workout until next summer but in the mean time I can make any adjustments to the design if needed. Hope you have found this useful and check back to see how it is performing.