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Gerd your trough is SO natural and pretty, a lovely example of your plantsmanship (if there is such a word) Campanula cashmeriana and Cymbalaria muralis are also gorgeous I think I have the last growing here seeded from the wild and it is a miniature beauty
Just received two pics of Viola spathulata made by Dieter Zschummel in Iran (digitalised) - I take the opportunity to add an image of this extraordinary violet growing happily in a trough in front of the house + Campanula cashmeriana and Cymbalaria muralis growing nearbyGerd
Cohan, your comments in the other thread reminded me of something else... I was very kindly given some rooted echeveria cuttings last spring, which I reluctantly accepted (given that I have next-to-no interest in house plants, and yet feel a little guilty about growing them as mere annuals!) I planted them up in a 17" W (43cm) x 7.5" H (19cm) unglazed terra cotta pot filled with half grit/half compost, along with some sempervivums and sedums from the yard, to fill it out. The pot sat on a wooden deck that is raised a few inches off the ground through the winter. All that survived, come this spring, are a couple of little sprigs of Sedum reflexum. Meanwhile, the same small unknown sempervivum that died completely in the pot has survived in one of our rectangular troughs for 12 years, and also in our square troughs and in the ground for a few years. (I started moving some divisions to the square troughs and to various other areas in the yard a few years ago). While this is hardly conclusive, I can only imagine it comes down to the volume/mass again... and a delicate balance... ?? The pot, though terra cotta (which helps, I imagine), has less volume due to the curved sides, than do our square troughs. Plus, the pot was raised off the ground, which is very likely detrimental. Beyond that, I dunno...