Erwin, it sounds like you have a lovely family - your plants must be a nice quiet hobby for you! I am grateful for the time you take to share your experiences with us here
Thanks for your warm words, Maggie!
Gardening -which also includes your forum in a broad sense- is my way of recreation.
@mark: maybe this is due to bad aereation of the substrate, which is often the case if organic content is too high or the mineralic content is not coarse enough. Especially when grown in pots/containers in which the substrate always tends to be compressed at the bottom. In such a case the substrate also becomes wet at the bottom while it can be bone-dry on the surface, which is especially bad since the (mycotrophic) roots are sitting ABOVE the bulb.