I decided that I would include tithonia in my garden this year. Someone in the midwest that posted pictures of it last year, and was excited about the number of butterflies that it draws. ( The name is on the tip of my tongue, but it isn't making it to the tip of my fingers.) At any rate, as I was placing my order, I noticed that somewhere on the screen that there was a notice stating that sunflower seeds can inhibit the growth of grass, and I believe other flowers. I know that this is true about grass because of conversations that I have had regarding the bird feeder.
I am trying to figure out if tithonia will affect the other flowers around it as it is growing or it I only have to worry when it goes to seed?