Hi, its my first time growing rigida do you deadhead down to the next leaf joint when the flowers have done or leave the seedheads on ( which I find very attractive ). And do they self seed easily.
So far I haven't looked to see if they need deadheading,but I never used to do anything with my Verbena Bonariensis,just let them seed.The Rigida look as though they will be ok for cut flowers now the sweet peas are going over a bit now.
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I can only tell if there's a shrivelled petal hanging off!