Answer: You are correct in that the differences are not great. They are both excellent bloomers, with similar growing requirements. 'Stella de Oro' is a deeper gold shade and blooms from mid-June through fall if you remove spent blooms. 'Happy Returns' is actually an offspring of Stella and 'Suzie Wong.' Like Stella, it blooms for a long period, but its flower color is a bit softer yellow, like the 'Suzie Wong.' I think you will be happy with either one of these attractive daylilies.
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