Commercially available

• "Grandma's Yellow"

21 favorite votes.  
Average rating: EXCELLENT.  

Medium yellow.

Bred by Unknown (before 1998).

Found Rose, Grandiflora, Hybrid Tea.  

Butter-yellow.  Does not fade in full sun..  None / no fragrance.  Double (17-25 petals) bloom form.  Blooms in flushes throughout the season.  

Height: 4' to 5' (120 to 150cm).  Width: 3' (90cm).

USDA zone 6b through 9b (default).  Can be used for beds and borders or garden.  Heat tolerant.  Disease susceptibility: very disease resistant.  

Collected prior to 1998 per the Plant Answers web site.

http://www.plantanswers.com/grandmas_yellow_rose07.htm

According to Texas Cooperative Extension, "Nacogdoches" was Found in Nacogdoches, Texas growing under an abandoned motel overhang. Six plants were grown in the garden of Tillie Jungman, near Castroville, Texas. Two of the plants were clearly superior to the other four, being more vigorous and disease-resistant. The roses was tested for disease resistance and suitability for growing in Texas and subsequently renamed "Grandma's Yellow" in honor of Miss Tillie, who died in 2005.

Roses that have been suggested are:
1920 Souvenir de Claudius Pernet
1927 Julien Potin
1937 Golden State. Not. Refer comments for "leans towards apricot, and has oddly rigid petals and plant."
1942 Mme Marie Curie
1943 Lowell Thomas
1952 Buccaneer. Perhaps not possible, Too tall.
1955 Gold Strike - or 1977 ?
1956. Allgold. Perhaps not possible
1961 Amarillo
1962 Summer Sunshine. Perhaps not possible, Foliage has grey tones.
1970. Sunblest. Perhaps not possible, Has a pale glossy leaf
1971 Golden Fantasie. Perhaps not possible.
1972 New Day/Mabella. Has a squareness about the bloom, and a white edge.
1975 Oregold. Perhaps not possible, large thorns, very glossy leaf, very dark foliage.
1977 Allspice. but may be too tall
1983 Goldstar. Not. Refer comments for "quite wispy and thin-wooded."
1984 Selfridges. Perhaps not possible, Too tall.
1984 Sunbright. is thorny, hates cold or wet winters, and is stiffer.
1988 Celebrity. Perhaps not possible, Some pink/red on the petal edge.
1988 Graceland
1989 Holterman's Gold