30 Flowering Maple Tree Shrub Chinese Bell Flower Seeds BLOOM TIME: All Summer (Even Indoors) HARDINESS ZONE: 10 - 11 (Or indoors in containers) PLANT HEIGHT: 24 - 36 (Up To 12). . . PLANT SPACING: 24 - 36" LIGHT REQUIREMENTS: Sun - Part Shade . . . SOIL / WATER: Average Red, Orange, Yellow, Pink, & White. The Flowering Maple makes an excellent houseplant. As an annual plant, it typically only grows between 24-36 inches tall, but if it gets a chance to continue growing can reach heights of up to 12 feet. It blooms all year round indoors, and has so many beautiful shades of flowers. If you take a look at all of the pictures above, you will see that the flowers look very different in their various stages, all of which are as lovely as the next!