Last year I started growing some asparagus and an artichoke in my little front garden, I was delighted to discover unless it was ridiculously hot I could get away with watering as little as once a week!
By contrast not last summer but the scorcher the year before I found my self watering some pots (toms in particular) as often as twice a day. It's also quite devastating to notice that the lost water is often brown and I fear packed with nutrients <sob>
What have folk tried to reduce the need for watering containers? Which containers have proved to be the best for retaining water? etc
I think that in really hot weather container growers just have to accept the fact that they will need to do a lot of watering. Some of my smaller containers require twice a day so I try to grow in the largest containers I can lay my hands on. I also use my own home made compost with loads of organic matter in it and garden soil which does help to retain moisture. Black pots are the worst as they absorb heat so you should put something reflective round the containers, even if it's only white cardboard.