Answer: Unfortunately I am still not clear on which plant(s) you are trying to grow. If there is a flowering tree in a twelve inch container, it probably needs to be repotted into a larger pot. Crowding of the roots can cause the plant to dry out very quickly between waterings and causes it stress. If you would could ask again using the Q&A form and explain what kind(s) of plants these are, we would be happy to try to give you a better answer. I am sorry I can't be more specific.
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