You probably have noticed that you tend to lose soil through the drain holes in plant pots. Ages ago—I think it was the Pleistocene—we use rocks to block those drain holes. Then later I remember that we used chards of broken clay pots to prevent soil loss. Recently we have used that fiberglass tape that is used to cover the seams of sheetrock. I have 3 or 4 rolls of this tape that I’ve picked up at garage sales. What’s good about this product is that you can use it over and over again. I would give you a life-time supply if you would just let me know. But since I know you won’t bother to ask, here is another solution to your soil loss problem—coffee filters. The large size filters fit perfectly in the bottom of gallon pots and you can use filters torn in half or in quarter for smaller pots. Large pots are where we have to resort to the webbed tape (and remember I have lots!).
Stan, The Rambling Man