The large, beautiful and colorful flowers of Rose of Sharon trees. The colors of my 4 main trees are: white, 2 different colors of purple and a pink one. There are also a bunch of smaller trees that over time grew from seed themselves: a few different shades of purple and a white one.
The trees flower for about 45 to 50 days with peak bloom being for about 2 to 3 weeks. They attract tons of insects from a large variety of species. The flowers also attract hummingbirds. Once they finish flowering and the seed pods are only what is left, they will attract many other birds too and of course squirrels and chipmunks too.
Rose of Sharon trees are incredibly easy to grow. All the Rose of Sharon trees I have, I planted myself either from seed or they seeded themselves. In fact, you have to end up pulling out a lot of seedlings over time from places that they shouldn't be growing. If you start them from seeds, they will grow easily. Unfortunately, you will not know the color of the flowers of the plant until it actually flowers. Generally, most seeds will produce a purple color variety with white being the next prevalent and pink the least.
The plant can also be easily dug out and transplanted even when the plant is say 2-4 feet tall, it just takes it a year or two to regrow its root system and get used to its new environment. The 3 main trees I have, I transplanted 2-3 times that is why they are in the color pattern they appear - I already knew their flower color. The pink one just happened by chance to grow in between 2 of them.