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This plant flowers profusely. Unfortunately, we missed it and can only show you the calyxes.

Growth habit.

Caryophyllaceae

Large, virulent clumps of spreading stems bear white flowers with inflated calyxes.

Plant Type: perennial

Plant Form or Habit: rounded/mounded

Plant Use: In rock gardens and as edging, if you must.

Propagation:

seed

Flower Color:

white

Bloom Period:

late spring
early summer
mid-summer
late summer
early fall

Width: Minimum: 24 inches     Maximum: 16 inches

Foliage Texture: medium

USDA Hardiness Zone: 6

Water Requirements: average

Additional Comments: Invasive!!! We were forced to eradicate it. If you like Bladder Campion, we strongly suggest planting the subspecies of S. vulgaris — S. uniflora (maritima). It's a nicer plant and much more well-behaved.