Citation styles used in Horticulture vary, and may include those for a particular journal. RefWorks and EndNote Basic supply a number of styles that may be appropriate. Zotero and Mendeley are free resources that do similar work.
Plagiarism is defined in the University of Arkansas Catalog of Studies as "offering as one’s own work the words, ideas, or arguments of another person without appropriate attribution by quotation, reference or footnote" (section on "Academic Regulations: Academic Honesty").
The consequences of plagiarizing another's work can be very serious for your course grade or even for an entire academic career. Plagiarism and academic dishonesty go beyond simply cutting and pasting text from an article or book into your paper without attribution; they can include paraphrasing without attribution or even citing sources that you have not consulted in your Works Cited list.
Citing your sources is the first step to avoiding plagiarism.
EndNote Web is available through Web of Science and is available to U of A faculty, staff and students.. It allows you to save citations to a personal database and then format those citations in footnotes, endnotes, or bibliographies.
Zotero and Mendeley are two of the free citation managers that are commonly used in academic circles; we don't have formalized support for them, but they have help pages and your librarian may be using one or more of them.