Cladrastis Sinensis

Just out of interest does anyone have experience of this rare large shrub/small tree; I started one from seed about 7 years ago, it is a stunning looking plant when in leaf, it is currently growing well in a large 45 litre pot and is now an attractive multi-stemmed plant about 4 1/2ft high. It has yet to flower, but I'm hoping it might do before too much longer, the seed supplier I got it from said it may flower within 5 years from seed but probably nearer to 7-10 years, so fingers crossed...