Bobo has become my favorite hydrangeas for the last 2 years. I have 2 planted in a full sun location in the fall of 2013, as 2 quarts (~ 1 ft tall) small plants ordered online since local stores did not carry them yet. Both gave nice and long blooms in 2014, and have been doing great ever since. The size is much more compact (~ 3'x3') so this is a big plus for my small chicago area lot. In spring time, I only sprinkle a little bit (1 tbs per palnt) of Miracle-Gro® Shake 'N Feed® All Purpose Continuous Release Plant Food. There are several kinds, I use the one with NPK 10-10-10. I don't typically use fertilizer but rely mostly on mulching well. I agree with NHBabs that these H. paniculatas need to have more sun for best performance. Mine is planted in the same full sun bed with cone flowers, Phlox and black eye Susan. I almost never water them so Bobo endures the summer heat and drought just as well as cone flowers, etc. I did notice that my neighbor's little Lime blooms much less as they are in a partial shade locations than my limelights (full sun). I understand the fun sun in zone 5 (chicago) may be different from other areas.

It does look like that! I'll see what the response to that suggestion is.

Thank you, that's it. I greatly appreciate your knowledge and prompt response!

I don't really have any other ideas except to be fairly certain it isn't Wisteria. Nor does it looks like any peas, beans or other legumes I am familiar with. Does this plant definitely come from the quarter sized seed or could it be from a smaller seed that was hidden in the mix? It looks too small to come from such a huge seed. Does your BIL know where the other plants came from? Could one of them be the large seed? He wouldn't be confusing the Oxalis corm with a seed would he?