There are suitable plants even for sandy soils. We still have a property in MV near Brandenburg, and it is sandy soil. We have numerous roses, various shrubs, and also large trees there, and they all survive without human intervention, because if they are watered at all, it is only when someone from the family is there. Most of the time, no one is there. Only a few perennials have not survived, but then you simply use others. We have ground cover plants as gap fillers in the beds because most perennials did not survive in the long run without watering and weeding. However, gladioli and ornamental alliums, among others, have survived there for years without much effort. The large trees, which provide shade for some hours, certainly contribute to this. These are all factors that come into play. Provide partial shade, choose the right plants, plant in autumn and not in spring. What does not survive does not fit in the garden and must be replaced with something suitable. No garden needs to be watered daily, and newly planted plants do not have to be watered every three days either. Neither does vegetables, if you mulch. Collect rainwater. This way, you save an incredible amount of water, have more time and peace, pay less money, and protect the environment.