Q.Vitex not colorful
I have two purple vitex in my yard and one of them blooms but the blooms are droopy and not colorful. They are green and gray. What do you think is the problem?

The varieties of Vitex range from soft white to dark purple and every range of color in-between.
You may have 2 different cultivators.
Here is a link to refresh you on the care and growing requirements.
Pruning annual will help the shrub maintain a nice shape.
https://www.gardeningknowhow.com/ornamental/trees/chaste-tree/chaste-tree-cultivation.htm