Though I live in a state with 2,276 miles of tidal shoreline, I don't live on the beach. Maybe that's why I love this container beach garden at Over the Crescent Moon - it looks like a lovely way to bring the beach home. I have read that seashells raise the ph of soil (making it more alkaline), so you would want to keep the ph needs of your plants in mind when putting this together. Of course, the sand must be acceptable to the plants as well.
By the way, here's a little trivia on the etymology of "alkali":
The word "alkali" is derived from Arabic al qalīy = the calcined ashes, referring to the original source of alkaline substance. Ashes were used in conjunction with animal fat to produce soap, a process known as saponification.
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