Hong Kong Orchid Tree (Bauhinia Blakeana) 15 Germinated Seeds Risk Free! Ready to be planted! GERMINATED SEEDS! Seeds fresh and ready to grow! When this tree is in bloom it's a real showstopper! The lovely Hong Kong orchid tree produces color from winter through spring, with breathtaking reddish-purple flowers as large as 6 inches across. When many other plants aren't in bloom, one of these magnificent purple-flowering trees can light up an entire landscape. A fast grower to 30 to 40 feet, this tree prefers a well-drained full to part sun location with plenty of room to spread out.