Hybridises with other Willowherbs, namely:

• New Zealand Willowherb (Epilobium brunnescens) to produce Epilobium × brunnatum
• Hoary Willowherb (Epilobium parviflorum) to produce Epilobium × floridulum
• Broad-Leaved Willowherb (Epilobium montanum) to produce Epilobium × interjectum
• Marsh Willowherb (Epilobium palustre) to produce Epilobium × fossicola
• Square-stalked Willowherb (Epilobium tetragonum) to produce Epilobium × mentiens
• Great Willowherb (Epilobium hirsutum) to produce Epilobium × novae-civitatis
• Pale Willowherb (Epilobium roseum) to produce Epilobium × nutantiflorum
• Short-fruited Willowherb (Epilobium obscurum) to produce Epilobium × vicinum.

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