While two variegated leaf Kousa dogwoods (Cornus kousa ‘Samaritan’ and ‘Wolf Eyes’) have no flowers this year, two green leafed Kousas fully display their floral splendor (below). Two young Kousa varieties, the columar ‘Snow Tower’ and pendulous ‘Elizabeth Lustgarten’, have scattered blooms, with both growing with a vigor encouraging me that they will mature before…