The watering basin is a planting technique in which the plant or tree is not planted at ground level but instead is sunken so that water is directed downwards rather than away from the plant. As a result, the plant’s roots grow deeply rather than superficially. As an added benefit, the basins both catch rainwater and make deep watering by hand much easier. The technique is a hallmark of the irrigation-free landscapes we do, and, lo and behold, is something that just an everyday resident of Colton, California, has been doing too (see photo above).
And yet, when I first shopped this planting idea around to landscape professionals and arborists when we were pitching the irrigation-free idea, I was told by many that this was bad practice. Once we had secured public funding for the pilot Irrigation-Free Landscape and I was in the thick of installing it, there was actually a professional landscape designer working on the landscape next door. While I was planting one of numerous grasses in the basin-style of planting, she came up, grabbed the plant by the crown, and said, “Why are you planting it this way? Don’t you know you are supposed to plant the crown just above soil level?” I said that I was, but above the soil level of the bottom of the basin. She was not convinced. In another conversation with an arborist, I was told that you could not plant trees in this basin style, because their roots would grow out and around and eventually girdle the trees.
In fact, within educational materials and at workshops put out and on by professionals working in the realms of sustainability and landscapes, the watering basin is simply never suggested. Rather, you are to plant your drought tolerant plants in the same way you’ve planted any other plant, and you are to still tether them to an irrigation system. In short, within the worlds of landscape architecture, design, and arborists – the professionals one would think would be at the forefront of real techniques for sustainability – there is at one end a limited take on designing for drought, and on the other, outright resistance to new techniques.
The truth is, landscape professionals and designers can be woefully unwilling to step down from their lofty seats of professionalism and advanced degrees to look at what everyday people are doing in their own landscapes when responding to drought – both in terms of planting technique and design. No, this is not to say that landscape professionals know nothing; rather, it is to say that we don’t have all the answers. No one does. And sometimes those answers lie within the work of non-professionals and what kinds of drought-tolerant vernacular landscapes they are making.
And so we come full circle to this resident in Colton, who clearly understood on an intuitive level that given low rainfall and high heat in a place like Colton, planting the trees in basins makes perfect sense, and the resident’s work has resulted in plants that are surviving and thriving.