Ina asked how to tell how dry a pot is which contains a lot of pumice. Hi Ina, For some pots, I weigh them at the time I pot them, before adding water, and then again when saturated and then later if I am unsure how dry it is, I weigh it again. Except for the weight of the plant, any difference is the loss of water. I only do this for a few special pots, such as my Lycoris sprengeri seedlings and my Ammocharis longifolia. The mass at the time of planting is with the potting mix only slightly damp, which is what I assume the bulbs prefer. Of course I cannot do this with the pots in the plunge bed so for them I just guess. I have one of those prong things but it only measures the most extreme dry and soggy. The pronged thing does hint at what depth the moisture changes. I do not stick the prongs into bulb pots for fear of spearing the bulbs but I do stick it into the sand of the plunge bed. If I am unsure, I guess based on how long it has been since it has rained or I have watered. My hope is that the potting mix with mostly pumice will not hold enough water to drown the bulbs. But I do not know this for certain. This is a good question. I am curious what others do. - Gastil