The height of a bud vase can vary depending on the type of flower or plant it is intended to display. However, most bud vases typically range from 4 to 9 inches tall. This height is ideal as it allows the vase to properly support the stem of the flower and display the bud or bloom in the most visually appealing way. It's also important to consider the space and setting where the bud vase will be placed. For instance, a taller bud vase might be more suitable for a dining table centerpiece, while a shorter one would be ideal for a bedside table. Always ensure that the height of the bud vase complements the overall aesthetic of the space it's placed in.