Is Verbena an annual or perennial?

Plant some every year, and beginning in the second year you'll harvest some rhubarb.

You want to make sure you're consistently removing any dead growth. Also, sometimes you might have a shoot that gets really long—you can go ahead and cut that back. Clipping...

You might not be giving them the proper amount of water. Review the watering steps in the article to ensure that your plant isn't getting too much or not enough...

Space plants 10 - 12 inches apart.

Prune the verbena in early summer or late spring to encourage growth. Be sure to remove dead or diseased foliage.

No, every variety of Verbena with the exception of the purple-headed variety are nontoxic. The purple-headed Verbena is toxic to animals.