Not to mention that several varieties of lonicera are mildly toxic. It's impossible to garner a complete list due to the sheer number of lonicera species, but jam may be the most dangerous method of ingestion because any toxins will be dense due to the reduction of water. I eat only the lonicera species berries that reputable sources have confirmed aren't toxic.

Can you provide a close up picture of the leaves? Also, you could cut open a fruit and see if it has a single seed (like a cherry does) or multiple small ones (like a crabapple, for instance).

Below is a link to one nursery in Quebec that lists it. Monrovia is a supplier of that cultivar here in the US. They may have a list of sources for you. http://www.monrovia.com/find-a-garden-center/ type in your location ( city, Canada ) to find the closest source near you ( hopefully) Here is a link that might be useful: Lemay nursery This post was edited by carol23 on Fri, Nov 8, 13 at 16:54

Jane, yours is a wild cherry, Prunus serotina, not buckthorn. It doesn't have the prominent leaf veins on the leaf underside that buckthorn has, and the edges of the leaf are finely toothed unlike buckthorn's smooth leaf edge. The cherries have their own stem with nothing but cherries on them rather than the buckthorn's many small stems for berries off of the main woody stem/branches. If you open one up you will recognize small cherry pits, and there is a bitter cherry taste if you are brave (I think buckthorn has 2 or 3 seeds.) One of the keys is the small lines in the bark (technically lenticels) on the cherries, where the lenticels on the buckthorn are dots. The other key factor for me is when you scratch cherry twig bark it smells like almonds, while the buckthorn has its own distinctive odor that isn't easily described, but definitely isn't almond. My memory is also that the buckthorn fruits have a clear yellowish flesh under the dark skin, while cherry fruits have the dark stain in the flesh in the same way commercial cherries do. Prunus serotina is native, and while it can be messy (the fruit stains as you would expect cherry to do) and it does seed around some, it doesn't IME outcompete and choke out other plants as buckthorn can do. Here is a link that might be useful: Prunus serotina, wild black cherry