I was trying to figure out what the problem is. I did not check all the links, but I did notice a link to a site that has a pop-up window and I think I remember reading something about those kind of links / sites are not allowed on HP. I wish I could remember where that info hides. -- That is such a beautifully done hub!
I really think the problem is with some of the links to sites. Sites like Wikipedia (that is white listed) we can link to as many times as we want. Also, it is possibly an Amazon capsule because HubPages only wants products that are highly relevant to the topic / content.
I hope you are able to figure out the puzzle without too much frustration. I would do a process of elimination if I wanted to keep the hub on HubPages.
I like the topic of the hub - here are my suggestions:
The photos are pretty, but the way they're configured (with squares and multiple images in one photo capsule) looks cluttered. That's a bit distracting.
The hug title mentions a specific hanging garden, but the text starts out with something else - I'd mention the hub in the title at the top, then discuss the other examples as needed while still focusing on the title garden.
Avoid first-person - especially in the lead paragraph. That can sound like a blog.
Some photos just say "Google" as the source - those photos are likely not used appropriately (Google Images are not public domain). Look for Creative Commons photos (wikimedia or morgueFile) and provide the proper attribution.
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