Hi ademink (aka Cockamamier - that cracked me up...): I don't believe that Cornus mas requires cross-pollination from another separate plant of this species - but my 'Golden Glory' individuals (original six) did not seem to ever set many fruit when they were the only ones of the species at the Valley. I have since planted several seedling individuals and several of a selection called 'Redstone'. I am appreciating more fruit annually now. Cause and effect? I am not sure, but it hasn't hurt. Since Cornus mas flowers very early in spring, when there are not lots of pollinating insects active, there may be a correlation with this situation. If you don't see many bugs out and about in late March/early April (for me) - and you aren't into hand-pollination of lots of little flowers while it's frigid - then you may always have small fruit crops. Also, be careful about insecticide applications. It is becoming standard to use systemic full spectrum insecticides, which kill anything that consumes plant parts that contain the chemical. That may end up causing damage to nontarget insects, such as the beneficials that are doing pollinating for us. Finally: multi-trunked doesn't necessarily mean more than one plant. Looking at your great array of images, I think you just have one tree with several stems from one crown. No further value in cross-pollination from that situation. If you have had pollination of your spring flowers, then you could go look now and see greenish fruit growing which will mature to red then purple this fall (if birds and rodentia don't beat you to it).

What do you want most, the pain or the pleasure? Dogwoods are very messy plants in the autumn. Their chief attraction is the glorious cold weather foliage - the spring flowers are nothing special - but of course this does drop off. If you don't want hassle go for a conifer...........Good luck. Ian

convert the common name to the latin thru google ... then add 'annual growth rate' ... and THEN research ... see link ... down a few links it says: When young, kousa dogwoods have a medium growth rate of about 13 to 24 inches per year. Older trees slow down, growing 12 inches or less per year ==>>> the variance is particular to where you live.. e.g pnw 8 month growing season ... MI 5 months .. its going to be much more aggressive in the former ... [if it grows there] no tree ever stops growing ... so dont put much stock on listed mature heights .. its all about how many inches it grows.. per year.. for how many decades ... though obviously.. this is not going to end up.. a 100 foot oak type plant ... one way to get a slower growing version.. is to buy a variegated version.. less green.. less food production .. less annual growth .. generally speaking ... but they may be rather foo foo for your area ... wherever that might be ... and it will probably be double or triple the cost ... ken almost forgot the link.. again: https://www.google.com/search?q=Cornus+mas&ie=utf-8&oe=utf-8#q=Cornus+mas+annual+growth+rate

we have all seen two plants in one hole... from bird dropped fruit.. to 2 acorns ... to two seeds with annuals ... [or a thousand maples in a gutter.. lol ...] imo ... that is not an issue .. as long as both plants are basically equivalent with future growth potential ... obviously.. if one will dwarf and outgrow another.. forcing it into shade ... then that one might not thrive.. nor be much of a pollinator for the huge one.. lol ken