The following question was received via email (from Arkansas, USA): We recently purchased a Summer Snowflake Viburnum. The tag said that the plant was developed at UBC. We have other viburnums. We are especially fond of 'Shasta'. The thing that "got" us hooked for this new one was the statement that it would bloom more or less continuously all summer. Our question: the first blossoms are now falling; should we clip off the spent blossom stems to facilitate new buds, or should the spent stems be left? Please advise. We are scheduled to be on your campus for a conference in June. We are looking forward to it!