If they aren't TOO invasive...I like almost ant flowering plant....even dandilions and creeping charlie...the big trick is to not let them "take over" ! That said, if I could totally eliminate one flower from the world..it would be the Shasta daisy ! There seem to be a million seeds in each flower..and each seed grows !! I fought a "losing battle" with Rita over bringing them to the "new" house, knowing full well that in 2-3 years they would become a pest, and she would regret planting them....they have, they are, and she does