If you’re looking for a garden flower with show appeal, hydrangea flowers are truly stunning. Large globes of flowers cover this shrub in summer and spring. Hydrangeas are popular shrubs with colorful flowers that bloom through summer and into fall. They usually bloom in shades of blue, purple, and pink, with some selections in white, green, or red. The hydrangea has a wide range of meanings, from heartfelt emotion to gratitude to boastfulness.