1. Hydrangea: It blooms in June and July in summer, and the soil is alkaline and blue.

2. Blue snowflake: a typical blue flower with elegant color, with a flowering period of May -65438+ 10.

3, cornflower: strong adaptability, like sunshine, cold resistance, heat resistance, blue flowers.

4, gentian flowers: most flowers, clustered, flowers are not pure blue, to be precise, blue-purple.

5. Morning glory: an annual twining herb with blue, pink, white or purple flowers.