It’s clever and economical with oya, the terracotta container has a neck that will protrude out of the ground, the rest of the container being buried. Using an oya in the middle of your flowerbeds in the garden means that the water that will filter through the walls will bring moisture to the roots of your plantations and that you will save watering. Indeed, the container being buried, the water evaporates much less and you will not have to fill it often (depending on the size chosen of course).
This technique is very interesting but the pottery called oyas is often quite expensive. How to tinker with a system inspired by these antique jars in our own way?
Emmanuel Grosbois offers us to take a pot of flowers in unglazed terracotta :
plug the small hole at the bottom with cork, bury your pot up to the height, fill it with water and close with the saucer which thus becomes a lid.
Emmanuel Grosbois can discuss it with you in person at the A Fleur d’Eau garden in Cherveux, in Deux-Sèvres.