| Hostaname | RG | SZ | Leaf color | P | F | Origin |
| H. 'Yang' J. & S. Wilkins 2002 | R | | goy,blgre | | | 'Maize and Blue' sport |
| H. 'Yankee Blue' Bob Balitewicz/W. Brinka 1999 | R | L | bl | | | 'Blue Arrow' x 'Elatior' |
| H. 'Yellow Bird' Herb & Dorothy Benedict 1991 | R | M | y | | | 'High Fat Cream' sport |
| H. 'Yellow Boa' Russ O'Harra 1991 | R | S | y>gr | | | 'Subcrocea' hybrid |
| H. 'Yellow Emperor' Robert P. Savory 1987 | R | ML | y | | | 'Honey' hybrid |
| H. 'Yellow Eyes' Peter Ruh 1999 | R | D | y | | | 'Green Eyes' sport |
| H. 'Yellow Flame' Jim Hawes 1999 | R | M | y,gre | | | ventricosa 'Aureomarginata' sport |
| H. 'Yellow Flash' P. Ruh 1997 | R | | ch,ye | | | 'Sagae' sport |
| H. 'Yellow High' Clarence Owens 1990 | R | L | ygr>y | | | 'Krossa Regal' selfed |
| H. 'Yellow Jacket' Marc Zilis/Peter Ruh 1998 | R | S | gr,cre | | | venusta sport |
| H. 'Yellow Polka Dot Bikini' L. Jones 2005 | R | | gr,(y>gr)e | | | 'Striptease' sport |
| H. 'Yellow Ribbons' K. Engel 1999 | R | S | y | RB | | 'Patrician' sport |
| H. 'Yellow River' Eric Smith/Paul Aden/Peter Ruh 1993 | R | ML | dgr,ye | | | montana sport or hybrid |
| H. 'Yellow Splash' Paul Aden 1976 | R | SM | str,gr,y,cr | | | 'Aden 270' x 'Aden 275' |
| H. 'Yellow Splash Rim' AHS 1986 | R | M | gr,we | | | 'Yellow Splash' sport |
| H. 'Yellow Surprise' Eunice V. Fisher/K. Hensen 1983 | R | | y>gr | | | rectifolia hybrid |
| H. 'Yellow Waves' Paul Aden 1978 | R | DS | ly | R | | 'Wogon' x 'Chartreuse Wiggles' |
| H. 'Yellowtail' E. Elslager 2005 | R | | goy,blgre | | | (x 'Galaxy') hybrid |
| H. 'Yesterday's Memories' Hans Hansen/Shady Oaks 2005 | R | | gry,dgre | | | 'Squash Casserole' sport |
| H. 'Yikes Stripes' S. Megos 2007 | R | | blgr | | | unknown |
| H. 'Yikes! More Strikes' Ed Elslager 2004 | R | | | | | 'Breeders Choice' seedling |
| H. 'Yin' J. & S. Wilkins 2002 | R | | blgr,crwe | | | 'Maize and Blue' sport |
| H. 'Yojimbo' D. & J. Ward 2003 | R | | gr | | | 'Sagae' hybrid |
| H. 'Yorick' Lantis/K. Squires/P. & J. Ruh 2005 | R | | dgr,cre | | | unknown |
| H. 'You Light Up My Life' Ed Elslager 2003 | R | | dgr,crwe | | | 'Foxy Doxy' x 'Maekawa' |
| H. 'Yucca Ducka Do' Ran Lydell 2000 | R | M | gr,ye | | | 'Minuta' hybrid |
| H. 'Yuma' Van Wade 2007 | R | | blgr | | | 'Something Old' x 'Woodland Blue' |