viburnum dentatum..I have Blue Muffin and Chicago Lustre and to be honest they look the same to me..

Wow, that was quick! I was hoping it would be something useful, and I'm glad to hear it's Vib. Thanks!

though Nicholsworth's 2 varieties may look similar, they will enhance berry production

If they are in fact two different clones and those two clones also happen to be cross compatible.

NH, thanks for answering my next question! I have a large older Maple Leaf or Snowball

Viburnum (as far as I know...) in my yard, picture attached. It is actually a number of connected (sucker) plants that I dug out of the yard of an abandoned and soon to be torn down farm house almost seven years ago. My, has it grown.... Even though I have other younger Viburnums in other parts of my yard, this one has never fruited. So my guess is that maybe the others will soon allow it to produce and make my birds very happy!

NHBabs..oops..I corrected the name..I know where my viburnums are planted but not totally sure which ones are which??..might study them this summer and see if I can figure it out..they've been good shrubs and provide a nice screen..

Viburnum opulus 'Roseum' aka snowball viburnum is sterile. It will not produce berries.

Embo, yes one might be mislabeled, but I took her at her word as far as varieties. Are there same species but not compatible V. dentatum, presumably due to non-overlapping bloom times?

Nicholsworth, I didn't notice an incorrect name . . . sometimes I read what I assume will be there rather than what actually is.

NHBabs..I put Blueberry Muffin instead of Blue Muffin..you never have a superior attitude..just wanted to correct it..I paused when I typed it but then kept going..

Floral, thank you for letting me know Snowball is sterile, saves me a lot of hassle trying to get it to fruit!

There are other snowballs. This one tends to be differentiated as Common Snowball.

Hmm, am I correct in thinking now that all Snowballs are sterile? This was an older plant in a yard that dates back to the 1800s. Some parts of the original root system were 4 inches thick, and I separated the parts that led to the suckers which were clearly alive.

Yes, you are correct in that assumption :-) Like hydrangeas, viburnums are comprised of flowerheads that typically have a combination of sterile and fertile florets. The snowball types with their almost perfectly rounded, ball shaped flowers are all considered to be comprised only of the sterile (and more showy) florets.

Viburnum opulus 'Roseum' (aka 'Sterile') = common snowball bush

Viburnum plicatum - Japanese snowball

Viburnum macrocephalum - Chinese snowball (really V.m. 'Sterile' - the wild form of the species is seldom seen)