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World of CitrusWorld of CitrusFoster Seedless Grapefruit
J.V. da Graça, E.S. Louzada, and J.W. Sauls · Proceedings of the International Society of Citriculture · 2004
The paper says a Foster Seedless tree, itself derived from a Foster bud sport, bore very dark-red fruit on post-freeze recovery growth in 1930; that fruit was named Hudson. Hudson was not commercially developed because of its seediness (p. 369). This is a report about a tree and its recovery fruit, not a claim about every Foster Seedless tree; the paper gives no freeze temperature, duration, or protection.
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University of California, Riverside — Citrus Variety Collection
https://citrusvariety.ucr.edu/crc1198 (opens in a new tab)
The UCR Foster profile reports that Foster gave rise in Texas by bud mutation to the seedless pink-fleshed Foster Seedless, which resembles Thompson but has somewhat better flesh coloration. It gives no date, grower, or precise Texas locality for the mutation; this is an attributed profile statement, not an independently identified Foster Seedless accession. Existing archived UCR capture reviewed 2026-10-03.
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