posted 1 year ago
You know, we run a very weedy dryland garden. A few months ago I was complaining that no reforestation seems to be working around us. No forests, no rains. Without reliable rains, dryland gardening is not enjoyable.
So I wondered how we could increase the chances at reforestation. Contour swales? Not likely. We don't have the resources.
Maybe planting herb hedges on contour? That could work, but the herbs need to be very resilient and thick at the base.
Among the many herbs I regularly cut for mulch, there's this one, the hyparrhenia hirta (cerrillo), which ressembles vetiver. Its base is bushy, so it looks like it can slow down runoff water. It's not vetiver, actually, it is pretty invasive, but alas, it has already invaded this ecosystem. A few more cannot do harm. Could it work? This plant is one of the few that keeps growing regardless of the draught and heat, even better than fennel. I don't know why I didn't think of using it before.
I've searched the web, and it seems that there's an organisation promoting the use of vetiver contour hedges, even with instructions on how to do it properly. Propagation, planting distances, etc. The hyparrhenia is smaller than the vetiver, so I have to reduce the planting distances, that's all. The easy way to propagate vetiver is by root division. I hope it works the same with our weed. But the terrain is too dry to do it right now.
If we got rains this Automn, I'd try a few hedges in our sloppy areas of the garden. And if that works well, I'll try a few more on the areas above ours. If it lives up to the promises, I'll promote it to the city foresters that are in charge of the local reforestation, because planting pine trees is clearly not working.