Given the number of, and space in the garden allotted to ponds, there are disproportionate mentions of plants on these pages and few comments relating to water features. Except for discussion of snakes, that is, and after a summer of harassment from my wife, the one remaining Northern Brown is keeping a low profile.
Probably, many readers would suppose that keeping up with five ponds in the garden, ranging from a hundred to fourteen hundred square feet, would be a full time proposition, even without another acre of garden to care for. Wrong again. Little time is spent maintaining the ponds, most months none, and only in the spring is a quick clean out necessary, though the large koi pond is never cleaned.
Occasionally, there’s a little something. A pump gets gummed up, or a leaf basket must be emptied. Plants along the edges of the ponds must be managed, cut back in early spring, and occasionally pruned if they become too rambunctious. Sweetflag (Acorus) and yellow flag iris (Iris pseudacorus, above) can go a bit wild growing in shallow water, and it won’t be long before the vigorous clump of Pickerel weed (Pontederia cordata, below) requires some attention. But this is minutes a year, not hours. By far, more time is spent feeding the koi than maintaining the ponds, much less time than it takes to weed any single area of planting.
However, the koi pond has reached the point that something must be done. The biological filtration that kept the pond clear for years is being overwhelmed by the increased koi population. I’ve resisted as long as possible, but it’s time to invest in more advanced filtration. It’s killing me, but I’ve been forced to add an external filter. Installation is pretty simple, but not inexpensive for this large volume of water.
I’ve little doubt that with the filter hooked up the water will quickly clear up, so I’ll be able to see the koi again, not only when they surface to feed. For the smaller ponds, this should never be a problem, but the koi pond started with ten fish and now there are many, many more, with exponentially more every year. I tried netting and moving some to the other ponds, but it became clear that I can’t keep up. So, I’m not complaining about there being too many koi, but this requires better filtration, and now’s the time.
I’ll report back as I see results.