I find it difficult to remember to regularly water all of my various growing spaces. Two of them (balcony and porch) don't have any water source which means watering is harder work and thus likely to happen; the back garden has water but I still struggle to remember and find the time to get out there with the watering can (time consuming in itself). So I've been looking into watering systems.
I already have most of my tomatoes in self-built self-watering containers, which work wonderfully. Mine are very basic, based around two florists buckets stacked on one another (full instructions in Permaculture in Pots!). For the third year in a row, the tomatoes in those buckets are thriving, and I want to make a couple more for next year.
I'm likely to construct more SWCs for the porch and balcony, but in the meantime I've been looking at other alternatives to use in the existing containers, as well as in the ground in the raised beds in the back garden. In the light of the permaculture approach of "make small changes and observe", here are the current experiments, all using things we already had lying around the house:
- On the porch, this is just a plastic bottle upended in the soil. Opinion online seems divided on whether you leave the lid on (with a hole punched in it) or take it off. I took it off, and it seems to me that the water just leaks out again too fast. Part of the problem, I think, is that this box is too well drained; the first time I filled the bottle, it all flooded straight out of the bottom of the box. This area is entirely under cover, so I could use a container without drainage, as it can't flood with rain. I will try a non-draining container here the next time the current one is empty.
- This box, out in the garden, uses the same plastic bottle system, again without a top. There's no drainage problem here (don't think this box has drainage holes!), but water still seems to drain out of the bottle very fast. I think you may need pretty damp soil to start with for it to work (so not suitable for all plants, though tomatoes grow fine with wet feet). I'll also try putting a cap on the bottle to see if that helps.
- Out in the back garden again, this is a ceramic pot buried in the soil. I got this variation on a traditional African watering system from the current issue of Permaculture Magazine. Again, currently mine seems to be draining too fast. Reading the editorial again, more carefully, suggested that I need a cork in the bottom, so I'll try that. I also suspect that I've buried it a little too deep and it would do better with a centimetre showing above the surface, so soil doesn't leak in. It could do with a cover to limit evaporation, but currently it's draining too fast for that to matter.
- On the other side of the same bed, I wondered whether a plastic pot with holes in the bottom would work similarly — like a cross between the ceramic pot and an upturned bottle. Again, however, it's just draining too quickly, and it takes up more space in the bed than an upturned 2l bottle would. I will try replacing it with a large water bottle, lid on, and see how that works.
I suspect that the best solution will be different in my different growing spaces, as the parameters, requirements, and limitations are different in all three areas. However, I would like to get some kind of watering solution in place across all of them before next summer. Watch this space for more experimental results!
Meanwhile, the rocket is doing just fine anyway.