Biennial brown-eyed susan

Asked August 25, 2020, 1:46 PM EDT

Hello. Is the plant I get in Year 4 the same plant I got in Year 2, or is the the offspring from self seeding during Year 2? If it's the same plant and it's on a 2-yr cycle, is it like periodic cicadas? That is, if I plant a Brown-eyed Susan in 2014, and another in 2015, do they send out a chemical signal and synchronize and both regrow the same year?

Anne Arundel County Maryland

1 Response

Each plant only lives 2 years, and it only produces seed the second year. So, a two year old plant drops seed that germinates the following year (making a new 1st year plant) and it in turn produces seed its next (2nd) year.

So, your "year 4" plant is the offspring by seed of your "year 2" plant--it is not the same as the original plant. (Plants that live for more than 2 years are called perennials.)

No, biennial plants do not synchronize.

Ellen