I suggest starting by installing a barrier about 8 inches deep around the bed to keep the bermuda out as it will be a continual invader in your flower beds. Metal flashing works well. Spade the soil in the bed and remove any bermuda you find. Then spread bags of compost to a depth of about 2 inches and mix it in well. I suggest you add a turf type fertilizer such as 15-5-10 at a rate of one cup per 25 square feet and mix it in with the compost. Then plant your flowers and water them in with a solution of a soluble fertilizer such as Miracle Gro at the label rate. Use this soluble product weekly to keep them growing strong.
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