Planting Between Rocks
Thanks for writing. You may need to create pockets of soil to plant in, depending on how your wall is set up. To do that, use a trowel, spoon, or other tool to fill a crevice with soil, then create a cavity in the middle of the pocket for your plant, and firm in the soil around the plant's root system.
---Justin, Senior Garden Editor, BHG.com
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