When they look tatty enough that you can't stand them anymore, or
after the foilage dies back in fall, whichever occurs first.
BTW, I have fround with most of my 'daisy'-types . . . shastas,
rudbeckias, etc., that, if I mow them down right after the first
flush of bloom fades, I'll typically get a second flush in very
late summer or early fall.
I just realized Black Eyed Susans are the state flower for Maryland in
the U.S. I assume that means this flower grows well in Maryland (even
without much human attention). What did Maryland residents do for
Mine seem happy with the 'throw seed heads in the general direction
of the ground and leave alone' method.
I do sometimes deadhead them, but my R. hirta and R. fulgida
don't seem to care one way or the other. Maybe I haven't deadheaded
them promptly enough.
Robert Grumbine http://www.radix.net/~bobg/ Science faqs and amateur activities
notes and links.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.