Hi people:
How very dangerous of our friend to share her findings and plans for her expanding collection. However, having water circulating from one tray to the other below is extremely dangerous. Nematodes, bacteriae, fungi and even virus can be spread about by the circulating water. This fact is well known in cacti and succulent collection. They have solved the problem by having the water from every tray pour to the front (or suitable alternatives) and never to that below.
Alberto
Ezeiza Botanical Garden
Argentina
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