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Fertilizer and ponds . . .
Now I know that it's a no-no to allow drainage from surrounding
landscape to contaminate a pond, due to the risk of accummulated fertilizer and chemicals. However, this is a different question: I have plants in pots that come from a lake-margins environment and which live in nature with their toes in the water, but nothing else. In my pond, they sit in pots on a ledge in the pond that's about 2 inches under the normal water line. I water the plants occasionally, and they seemed satisfied with the routine. I never fertilized for fear of contaminating the pond w/ fert runoff. Unfortunately, after a year of doing well in this location, the plants are beginning to show signs of nutritional deficiencies --- namely potassium and nitrogen (I am an experienced gardener and have had good success addressing signs of such deficiencies before, so I feel fairly confident in making this assessment). I'd like to fertilize the pots with something like Potassium Nitrate, but of course, that would gradually make its way into the pond, and then ---yikes! I know that water lilly fertilizer (in "pill" form) is used for totally aquatic plants by burying it in the media, and that the pots have no holes in the bottom, so the fert is more likely to stay in the pots and around the roots . . . but the fish regularly mess with the stones in the pots of the underwater plants and throw them about, so I wonder whether this fertilizer gradually makes it into the general pond environment. So I'm confused: How can fertilizer for waterlilly pots be OK, yet fertilizer for mostly-above-water plants not be OK? Thanks! |
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