| Hostaname | RG | SZ | Leaf color | P | F | Origin |
| H. 'Za Za Zoom' Stuart Asch 2003 | R | | goy | | | 'Gold Standard' seedling |
| H. 'Zachary Taylor' Hajime Sugita/Mark Zilis/Pete & Jean Ruh 2001 | R | L | y | | | unknown |
| H. 'Zager Blue' Herbert Zager/Pete Ruh 1987 | R | M | blgr | | | 'Fortunei' sport or seedling |
| H. 'Zager Giant Puckered' Herbert Zager/Pete Ruh 1989 | R | M | blgr | | | sieboldiana hybrid |
| H. 'Zager Green' Herbert Zager/Pete Ruh 1987 | R | M | blgr | | | sieboldiana x montana |
| H. 'Zager Green Rim' Herbert Zager/Pete Ruh 1987 | R | ML | gr,(lgr>gr)e | | | unknown |
| H. 'Zager's Pride' Herbert Zager/Pete Ruh 1987 | R | ML | blgr,che | | | sieboldiana 'Elegans' sport |
| H. 'Zager's Tokudama' Herbert Zager/Pete & Jean Ruh 2003 | R | M | blgr | | | 'Tokudama' seedling |
| H. 'Zager's White Edge' Herbert Zager/Lucy Simpers 1980 | R | ML | dgr,we | | | 'Zager Blue' sport |
| H. 'Zany Janie' Dick & Jane Ward 2009 | R | M | gr,str,cr,w,gre | | | 'Pin Stripe Sister' seedling |
| H. 'Zebra Stripes' Tony Avent 2005 | R | M | w,mot,gr | | | (x 'Outhouse Delight' ) x 'Abba Dabba Do' |
| H. 'Zebson' Leonard Jones 1998 | R | L | y,lye | | | 'Sum and Substance' sport |
| H. 'Zeppelin' Mark Zilis/Mary Beth Vanous 2009 | R | ML | blgr | | | 'Creme de Menthe' x (kikutii f. leuconota x hypoleuca) |
| H. 'Zest of Lemon' Bob Hackbarth 2015 | R | | lgr,goye | | | |
| H. 'Zeus' Fury' Kay Dye 2002 | R | L | dgr,str,w,y | | | 'Neat Splash' seedling |
| H. 'Zi Xing' Donghuan Liu, Fan Zhu, Jun Chen, Wenbin Shi, Chao Wang 2023 | R | | ygr | | | 'Korean Snow' seedling |
| H. 'Ziggy Stardust' Doug Beilstein/Robert Hatt 2022 | R | G | gr,str,y,w | | | 'Justice' x ('Brutus' x 'Abiqua Recluse') |
| H. 'Zimmerman Thunder' Mark Zilis/Global Garden/S. Compton 2008 | R | S | dgr | | | 'Lakeside Rocky Top' sport |
| H. 'Zip Code' Doug & Mardy Beilstein 2018 | R | | gr,crwe | | | |
| H. 'Zipper' Greg Johnson 2004 | R | | | | | 'Chartreuse Wiggles' seedling |
| H. 'Zippin Pippin' Bob Geske/A. & J. Geske 2022 | R | S | dgr | | | unknown |
| H. 'Zippity Do Dah' Walters Gardens 2000 | R | ML | gr,cre | | | 'Abba Dabba Do' sport |
| H. 'Zippity Zee Zaw' Mike Dammen 2024 | R | | y>ch | | | 'Hacksaw' seedling |
| H. 'Zippy Zepps' Stan Tylinsky/Alex Malloy 2003 | R | L | blgr,str,y | | | 'Regal Splendor' sport |
| H. 'Zitronenfalter' Heinz Klose 1988/Pete & Jean Ruh 2003 | R | M | y>ygr | | | unknown |
| H. 'Zodiac' Q&Z Nursery/Pete Ruh 2000 | R | | ch,cre | | | 'Richland Gold' sport |
| H. 'Zoe's Zesty Zephyr' Bob Keller 2011 | R | | lgr,str,w,dgre | | | 'Robert's Rapier' sport |
| H. 'Zounds' Florence Shaw/Paul Aden 1978 | R | ML | y | | | 'Golden Waffles' x 'Golden Prayers' |
| H. 'Zowie' Peter Cross 2000 | R | | goy,we | | | 'Norwalk Chartreuse' sport |
| H. 'Zuzu's Petals' Dennis Savory 1999 | R | | lgr,ye | | | 'Birchwood Parky's Gold' sport |
| H. 'Zydeco' Ed Elslager 2003 | R | | blgr,ye | | | 'Sea Prize' x hypoleuca |
| H. 'Zypunic Finale' Randy Goodwin 2013 | R | | dgr,we | | | "unknown" sport |
| H. 'ZZZZ, A Sleeping Beauty' Ed Elslager 2002 | R | | blgr,str,y | | | (x 'Dorothy Benedict') x 'Maekawa' |