Hi pearl
If it had been easy I wouldn’t have asked here
anyway
I don’t want to recreate The Gardens of Babylon but only a few square meters that with a good impact since they are located
next to the entrance of the house.
Maintenance, any surplus irrigation, failures and correction of errors are not a problem (I grow for the heck of it)
One thing is sure, however, I do not want a desert Sedum & co. with gray pebbles
My project is definitely full of wrong plants (Paeonia, as you rightly observed, will probably have some problems) but, for example, Anemone Japonica has been thriving for years in that position, by the way just where the soil is less thick, the same thing concerning the Baptisia and, believe it or not, even the Veronicastrum. On the other hand, experiences with Helictotrichon, Santolina and other things like that were negative.
Probably, in my case, the thinness of the substrate is balanced by its good water retention (poor drainage) and the fact that it rains a lot here (An average of at least 1500 mm per year).
The depth of the root system is also a good point, I wonder how far you push the adaptability of some plants to expand their roots horizontally to compensate the inability to go deep.
So as I understand it, the main problem would be the 'Beetstauden' mentioned by Sarastro, among other things; of his interesting list I must unfortunately reject Buxus (cydalima perspectalis here is a scourge) Centranthus ruber (it disseminates outrageously here) and Acanthus (always slumped in full sun)
I'm looking for replacements for Echinacea-Helenium-Aster NA and large ornamental grasses ...
…Achnatherum seems to work well in Wien-Schönbrunn
Immer noch meine ich, dass dieses Thema einen eigenen Faden verdient!
I'm not surely the one who will open it, I already regret having opened this!
Italian, German, English ... my head is spinning, sorry