Answer: I was faced with almost exactly the same dilemma in a friend's yard about 4 years ago. Her slope was very steep so it was important to cover it with attractive plants that would require very little maintenance. I opted for the following plants and it turned out quite nicely: Cosmos (very good for reseeding itself), Rudbeckia (both annual and perennial varieties spread very well), Cleome (reseeds very well), Poppy (reseeds) and many different species of Daffodil. The Cosmos, Black Eyed Susans, andPoppies have covered the entire hill and are breathtaking together. The Cleome has also reseeded well and adds vertical interest. We have probably 6 different varieties of Daffodil that have naturalized very well. She did some weeding the first 2 summers but really just ignores it now. We do fertilize it by tossing compost on the hill in the fall and broadcasting extended release fertilizer pellets across the area in the spring. (We use the brand called Once). I think the view from your deck will bespectacular when you are finished!
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