Hey, let me try to help u with this.... I saw one of your hubs named "An inexpensive way to start seeds".
As we know google reads the main headings also, mainly to decide what ads to show up on a web page. Now, in the hub or yours, i mentioned, you've put capsule headings for all the pics. Also, you have mentioned the "SHOE BOX" two times. Try changing that.
But still, sometimes it happens awkwardly, which will automatically figure out to correct ones.
One of the other things causing this issue is that " when google does not find any RELEVANT KEYWORDS". So you got to throw in some gardening keywords in your hubs while you write,
You may want to use this free tool of google... https://adwords.google.com/select/KeywordToolExter... .
And find the most searched terms to use. For example, if you write a hub on "gardening", you enter this keyword, or tag, you'll get the corresponding keywords which are related to this main keyword(gardening) of yours which are most searched, and you may use those of which u find appropriate,
Hope it helps...