I’m trying for the first time a method I’d read about some time ago. With this method, you take a 2-liter bottle or a milk jug or whatever container you want, and you put a small hole in the bottom of it. Place it where you want to water and fill it with water. The water will slowly drip from the container. It will drip so slowly, in fact, that it has time to be fully absorbed into the soil, rather than running off it or being evaporated by the sun. This will provide a slow, deep watering for the spot you place it.
I started collecting rainwater this year. I’m too cheap to pay for an expensive rain barrel, and in my situation I couldn’t use the spiffy hose on one, anyway. So I have a large, and I do mean large, tub sitting under a spout. I probably collected 35 gallons in that. When I’m on top of it, I bail some of that into a second container that holds something like 17 gallons. In a good rain, I collect some significant water which I’ve been using to brew my AVCTs (chloramine free!) and to water plants. I need to use up today what I collected last Sunday because I have seen the very first mosquito larvae. As soon as I see them, I use up whatever water remains in the bin. It takes something like a week for the mosquito larvae to complete its cycle and become a mosquito, so by doing this I make sure I’m not raising mosquitoes.
I’ve got my first 6 gallon milk jugs out in the garden, dripping as I type. I learned something, though: only put one hole in the container. A smaller hole leads to a slower drip and a longer watering time. If you put two holes, even small holes, you’ve just lost your nice, slow drip. I’ve got one jug that way and that is how I discovered this. It will still do a good job watering, but it won’t be quite a good as the others. (Also, don’t let your husband use a pocketknife to make the holes because he think the slit will work just fine. It won’t! Use a small drill bit or an ice pick or something like this.) It will be interesting to see how long it takes for those gallon jugs to drip empty. Only some of my roses will get watered this way. I don’t have enough water for them all. Hopefully we’ll get rain soon and I’ll be able to re-charge my water bins and then another bed of roses will get a slow, deep watering between rains which don’t come often enough this time of year when it’s blast-furnace hot.
Incidentally, you can use this same setup (a jug with a single small hole in it) to attract birds. Hang the dripping jug over a container that can collect the water. The sound of water will attract the birds. If you use a shallow container, the birds will likely bathe in it.