Depending on how many flower buds they sport, they should be in bloom about 3 weeks but the fewer the buds, the shorter the bloom season. If you leave them in place and allow them to reseed, they will produce next year and the development of the various plants will be staggered - that should extend your bloom season to some degree.

If planting from seed I often suggest succession planting over a period of weeks in early spring. This will achieve the same sort of results as allowing them to self-seed - you'll get a range of development in the various plants with the first planted the first to bloom.

Thank you so much! I couldn't find the answer to this anywhere. I even contacted the company I bought the seed from and they said they would have to find that information and get back to me. I'm new to planting flowers and placed these wrong so I am not letting them go to seed but I think the succession planting sounds perfect for their new home next year. Thanks again!