Thanks all of you for your advice! I am convinced and happy to be able to stop my frustrating search for the greener grass on the other side of the hedge! Better to use what is available free: juicy worms!
KT53, I can buy mushroom compost nearby, I borrowed a shredder to make pulp of branches and when I prepare the border for the coming season I re-use the manure that comes off. The whole I mix with new garden compost and a handful of lime. Vermiculite and perlite I indeed only use for sowing. So, I no longer look for horticultural grit, a frustrating journey, it is just not used in Holland and thus not available. But I am happy with the advice to let the worms work (thanks to Loxley and all the others). I still have to discover if mixing the pulp of branches will have been a good idea. But Fergus Garrett from Great Dixter does it also, so that cannot be too bad, does it?
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