These were volunteers that decided to take up residence in the Vegetable Garden. That’s fine with me since they attract the bees and other pollinators. They grown along the south side fence with the Marigolds.
SneIrish's Verbena bonairensis - Vervain Care Instructions
Ensure you have enough space in your garden for this plant - Verbena is known for growing to a height of approximately 1.20 metres (that's 3.90 feet in imperial).
Try to apply water fairly sparingly.
Your garden's USDA Hardiness Zone (6b) is not within the ideal known range for Verbena. The recommended range is between Zone 7 and 10. You may have to reassess this planting for suitability in your garden.
More information about Verbena bonairensis - Vervain is available in the Folia gardener's wiki. All Verbena bonairensis - Vervain Care Instructions have been kindly provided by our members.