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Predominantly outcrossing plant species are expected to accumulate recessive deleterious mutations, which can be purged when in a homozygous state following selfing. Individuals may vary in their genetic load because of different selfing histories, which could lead to differences in inbreeding depression among families. Lineage‐dependent inbreeding depression can appear in gynodioecious species if obligatory outcrossed females are more likely to produce female offspring and if partially selfing hermaphrodites are more likely to produce hermaphrodites. We investigated inbreeding depression at the zygote, seed, and germination stages in the gynomonoecious‐gynodioecious Dianthus sylvestris, including pure‐sexed plants and a mixed morph. We performed hand‐pollinations on 56 plants, belonging to the three morphs, each receiving 2–3 cross treatments (out‐, sib‐ and self‐pollination) on multiple flowers …