Green algae on pond
I have inherited what I think is a very old cattle / animal watering hole which is a pond in winter but dries up to a bog in summer. The water reaches about 5 feet deep at its deepest end where the sides are supported by a stone wall but the remainder becomes progressively shallower meaning the water has ample chance to warm up at the edges. Because of its size and also because it has a wall at one end, I thought I would leave it without a lining and so I have just cleared and planted up the banks abutting its edges. However, it has a mud base which i think would make fabulous soil for the garden but is far from ideal for the pond because I suspect its highly nutritious. I really don't ideally want to have to line it but I don't know if it is possible to keep it as a pond / bog garden otherwise. I have no plants as yet in the pond (I suspect this isn;t helping the algae situation) because I didn't know what would thrive in both a bog and a pond. Any thoughts gratefully received. BTW I have never cared for a pond in my life but am a reasonably knowledgeable plants woman!