I have a 'Blue Muffin" in my garden near Seattle, for maybe 5 years. It is perfectly healthy and perfectly drought tolerant, and tolerates saturated clay all winter on a slight slope (no standing water). It is MUCH larger than the label stated, it is over 8 feet tall now and growing fast, also it suckers, has become a thicket, and the branches splay out and take root where they touch the ground. It is probably 14 feet across, even with yearly pruning of the sides. I cannot imagine why they said this is a small cultivar, it is a monster shrub.

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I have both the 'Blue Muffin' and 'Autumn Jazz' cultivars of V. dentatum. I have read they are not self-fertile and you need another variety (or the straight species) blooming at the same time nearby in order to get berries. These two varieties work well together in this way here. I have also seen 'Chicago Lustre' listed as a good companion pollinator. The 'Blue Muffin' has a more rounded and compact shape than the 'Autumn Jazz', and the listed mature size is also smaller. The fall color and berry production is very similar between the two.

Robins get most of the berries here, but I imagine many other birds would like them too because they are small and easy to eat. One year I had a hummingbird clearwing moth (Hemaris thysbe) lay eggs on this viburnum, and I got to raise them to adulthood which was really cool.

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