Answer: Rudbeckia flowers most freely in full sun (minimum 8 hours) but will grow well and bloom sparsely in at least 4 hours of direct sun. The only other cause for non blooming is too much nitrogen fertilizer. If your plants are not getting at least 4 hours of direct sunshine, that would account for no flowers. They are such beautiful plants that I would consider moving them to a sunnier spot so you can enjoy and appreciate their cheerful flowers.
Q&A Library Searching Tips