Almost certainly those are seed grown trees, and assuming that is in fact the case, you may be waiting a few more years. Seed grown trees have to mature for a number of years (only they know how many) before they will flower. A grafted tree, takes a branch of another tree that becomes attached to the rootstock (another probable seed grown tree). This grafted portion "knows" that it is already some years old genetically, and therefore will begin flowering earlier. You likely seed grown tree will flower, but nobody can say how long that will be. BTW, flower buds are set in late summer the year before flowering, so you can examine your tree in the fall and determine if it will likely flower the following spring. The flower buds look kinda like an teardrop shaped onion in shape.You can find pictures on the net. Arktrees

Thanks a lot, gardengal. I've looked at descriptions of all three of those on VA Tech's vTree site. The fruit clusters looked similar enough that I was convinced it had to be a dogwood, but various details didn't seem quite right. vTree describes C. sericea as having bright red twigs, and I think I would have noticed that, but I don't remember the twigs being a special color like that. The bloom time seems too late for C. sericea and C. alba. C. sericea, C. alba, and C. racemosa are all described as shrub or thicket-like in form, and my friend's trees looked very tree-like, even a little lanky, almost like our native serviceberry. My friend and I both mistook the trees for cherries at first, like young P. serotina. If that's any help, the bark looked enough like cherry bark to fool a couple guys that are pretty familiar with most of the common native trees. C. sericea, C. alba, and C. racemosa are respectively described on the vTree site as up to 15, up to 6, and up to 10 feet tall but all generally shorter, and I'd say these trees were 15' or taller. It just seems like too many details don't quite fit. None of the options seem to fit the form. Could I be off altogether on the dogwood assumption? Are there other dogwood species that could be options? If not and assuming it's a dogwood, I'd have to lean toward C. sericea for height but not for the twig color and bloom time. C. racemosa seems closer to the right bloom time and the bark and twigs don't seem off (based on my rough memory), but the height and form seem too far off.

I don't know all the terms for plumeria flower parts, but if you study an inflorescence, you will see the main stalk, or peduncle. And numerous 'stems' or 'subbranches' arising from it which hold the flower buds. The buds on each 'subbranch' open up sequentially and never all at once. However, the more subbranches there are off the main peduncle, the more chances you have of flowers opening at the same time. Also, some flowers last longer than other, before they fall off. Don't know if this helps. Also, the more robust and established the plant is, the larger the inflorescences will be -- more subbranches per peduncle -- and consequently, more flowers.

Hi...thanks to everyone and their respomses. After i left the post, i looked inside ome of the blooms and saw that all of the stamens were black...i had only had this plant for a few days, and came to to the conclusion that it had gotten too cold during shipment to the shop my husband had purchased it from. Needless to say, all of the blooms fell off. So, i am now left with a beautiful green plant, and no flowers. Now i need help figuring out 'how' to possibly get it to re-bloom. Any advice would be so very appreciated. Thanks to all, and have a lovely afternoon. P.S. i only sat it outside to take the photo...it resides in my home in a bright window.