Mutations in sunflowers are not uncommon. But sometimes, mutations can be caused by a virus-like disease called Asters Yellows. The occasional mutation can be interesting. But when all of the sunflowers you've planted become disfigured, you won't be happy about it.

Just keep an eye on all of the plants in your garden. If you notice a trend of mutations in many species, then it would be easy to conclude that Asters Yellows has been introduced. It affects many different kinds of plants and is passed from one to another by leaf hoppers.

However, if you only find the occasional anomoly.....enjoy!