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World of CitrusWorld of CitrusUS SuperSour 1
Citrus Rootstocks
https://citrusrootstocks.org/rootstock-cultivars/ (opens in a new tab)
The index lists US SuperSour 1 parentage as Citrus grandis ‘Hirado Buntan seedling’ × Citrus reticulata ‘Cleopatra’ and its USDA release date as 2018. The table does not report selection, field performance, release contributors, or other historical events.
Accessed
USDA Agricultural Research Service
This shared USDA/ARS sheet gives US SuperSour 1's broad pummelo × Cleopatra parentage and states release on 2 November 2018. Its Hamlin and Valencia trial summaries report grafted sweet-orange scion yields; those are not intrinsic US SuperSour 1 fruit or yield results.
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Ute Albrecht; Fernando Alferez; John M. Chater; Mongi Zekri · UF/IFAS Extension
https://ask.ifas.ufl.edu/publication/HS1308 (opens in a new tab)
The 2026–2029 UF/IFAS guide summarizes US SuperSour 1 performance with sweet orange on the ridge and east-coast flatwoods, and reports higher yield than standard sour orange under tested conditions. This is extension synthesis, not a new trial; scion, site and management affect performance, and long-term data for new rootstocks are limited.
Accessed
USDA Agricultural Research Service
https://citrusrootstocks.org/wp-content/uploads/2020/03/US-SuperSour-1.pdf (opens in a new tab)
Primary USDA/ARS release document P.0071.18. It identifies the cross as Hirado Buntan seedling pummelo × Cleopatra mandarin and reports the 2003 cross, identifiers and cutting propagation results. Yield and fruit-quality observations concern grafted Hamlin and Valencia sweet-orange scions, not fruit intrinsic to SS1. The document’s signature date is unreadable; use the shared release sheet for the explicit 2018 release date. It does not identify the catalog’s specific Pink Fleshed Hirado Buntan seedling.
Accessed
Ksenija Gasic; John E. Preece; David Karp · HortScience · 2020
https://doi.org/10.21273/HORTSCI50register-20 (opens in a new tab)
The US SuperSour 1 description reports a diploid Hirado Buntan pummelo seedling × Cleopatra mandarin hybrid. It says suitability for uniform apomictic seed propagation had not been evaluated and recommends cuttings or micropropagation. This is a 2020 source-specific assessment, not a universal statement about later propagation performance.
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