My mom have a pretty nice backyard except for this one ugly spot. The grass is growing everywhere. She wants to clean out the grass and build a retaining wall. We already have a lot of bricks. However, she don't want to kill the palm trees. They have been there for about 5 years and is thriving. She want to clear all the grass out, put in new fertilizer and soil and grow some perennials in the spot. She also want to clean the grass around the area, and put in a concrete slab and a trellis with vines over it and put some chairs under it. We have attempted to clean out the grass, but they always grow back. Is there any product to clean out the grass for good and not kill the new plants? .

Here are the pics of the spot.

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This is the picture of the two trellis we have so far. I don't have any program on how to design a landscape design.