I started taking pictures and as I looked for best vantage shots to show off their flowers, I realized I probably might have enough for at least 1/2 batch of an elderflower syrup recipe.
Here are the two in mostly shaded, sheltered area next to the shed and kids clubhouse/playequipment.
They don't get any care from me and this area gets no additional irrigation, but they grow bigger and taller each year. You can see how tall the one behind the clubhouse is. -- there are flower clusters near the top -right corner of the bottom-right photo.
These next two are out in the open and at the lowest end of swales. The one in bloom is at the entrance to the Spiral Garden -- it has been sending out long rhizomes and I rip them out and chop them off. The other one is youngest. It's always the last to bloom.
The biggest flower cluster was from the Spiral Garden one. (11"/28cm colander) Another biggest blossom from one of the other shrubs also had the purplish stem. (Sunlight?)
But as you can see in the next collage, most had solid green stems. I ended up with 27 variously sized flower clusters and about 1/4 of 2 gal bucket of loose (bucket thunked down to settle) de-stemmed flowers: