Answer: Thank you for asking. Monrovia is a wholesale only nursery operating in the USA and Canada and does not sell retail by catalog or internet so it is not likely to be a useful source for readers in the UK.
Readers in North America would need to check directly with their local retailers to verify availability of any particular plant. These are independent stores and each one will have its own selection of Monrovia (and other) products; selection also varies depending on the season and even in some cases from week to week.
To search for retailers in a given area, you could try the dealer locator at
Otherwise, you might try telephoning the Monrovia headquarters but their normal business hours are Monday through Friday, a bit late for your deadline.
Best of luck with your article.
Q&A Library Searching Tips