International Register of Ornamental Plant Cultivars:
Hardy Herbaceous Plants (OROC Book 4.2)

NEW 6.9.2018
77 pages of the newest perennials you may want to grow
or know about

OROC Presentations: PDF - PPTX (Powerpoint)
New 4.8.2018
OROC Main Page: oroc.html

 OROC Book VIII (8.1) - the latest December 30, 2017 update edition  of woody plant cultivar registrations and listings, now with 128 pages of new tree, shrub, conifer, and vine cultivars. The OROC Trademark Policy is included

  •  Free OROC International Registers of Ornamental Plant Cultivars
    • Woody Plants (Book 5.2) - version 8.1 above replaces it but this edition is offered for historical reference
    • Interior and Tropical - 2018 release
  • How to register a new cultivar: while our forms are temporarily offline for revision, please email all plant data to
  • About Open Registration Of Cultivars (OROC)
  • For Coleus registration only please visit International Coleus Society (ICS)

Cedrus update in CWP when you subscribe

HP update on Genera I and J for subscribers

New cultivar counts due to revisions and updates:
Hatch's Perennials 2017-2018: new totals: 58 Iberis, 39 Juncus, 185 Opuntia, 65 Origanum, and 108 Nepeta cultivars.

Hatch's Perennials 2017-2018: now 68 Baptisia, 81   Bergenia, 21 Brunnera,362 Campanula, 56 Dicentra, 35 Disporum, 193 Geum, 121 Mentha, 192 Miscanthus, 162 Monarda, 297 Sedum,146 Veronica, and 97 Yucca cultivars.

Cultivars of Woody Plants: now 173 Aucuba, 292 Juniperus scopulorum + virginiana, 254 Salix, and 47 Sambucus cultivars

    Click here or the logo above for the original Genus Central content. 

click logo above or here 

Cultivar Name Thesaurus
Lots of adjectives and nouns to help us creatively name
new cultivars 

new cultivars based on particular traits
A summary of our research goals

GPIK: Garden Plant ID Keys
featuring identication keys you can put
on your phone or tablet for in field keying. The
very best keys with the most taxa, newest
nomenclature are almost all digital now

Hundreds of biographical sketches on leading developers of the modern landscape ornamental plants in general, covering botanists who found them, nurserymen who refined and distirbuted them, taxonomists who defined them, plant breeders who improved them, designers and architects who made them art, authors, educators, popular "gurus", noted collectors and other special folk who made our gardens so much better. High-res images of their works are included.
Available at Google Play Books for US$7.20-$9.00

Click underlined title name to view Save copies for your digital library
of distinguished botanical and horticultural monographs and studies

Bean's Trees and Shrubs Hardy in the British Isles
The British master himself and one of the most
influential woody plant guides in history. It
took me 10 years and about $150.00 to
find all the volumes on this shore. Now it's free.
Hibberd's New and Beauitful Leaved Plants
One of the mostly lovely plant books
ever printed. Stunning images and expert
commentary. Hibberd adored variegation.
Wilson's A Monograph of Azaleas
From the collector of many taxa himself,
this is splendid reading for even the
most experienced lover of the genus
Carriere's Trait General des Coniferes
One of the classic, core conifer books of the last two centuries. It's
amazing how many modern popular conifers this man named. Ever
see Carr. after a name? That's him.
Sudworth's Nomenclatural of the Arborescent Flora of the United States
I regard Sudworth as perhaps America's first great woody plant taxonomist. This is a stunning catalog not just of species, their synonyms,
common names, but also numerous cultivated varieties
Bailey's The Nursery Book
This was one of the most widely distributed nursery guides in the US and from the great one himself. I've always liked calling propagation by his terms of seedage, cuttage, and graftage. It seems so proper and academic.Bailey invented the word "cultivar" and conspired to be a "horto-botanical" writer, meaning that both horticulture and botany were blended into the whole. By the way he did all this while Dean of the College of Agriculture at the Ivy League Cornell University.

Virtual Arboretum Resources

Best nursery websites for general ornamentals cultivar info. Refer to GENUS CENTRAL™ MAIN FILES for the best genus-specific nurseries and collector websites.

Pauli is a free spreadsheet and database to 2000 of the finest Saintpauliaor African-violet cultivars ever released
and it offers full search functions by flower color, color patterns, petal count, leaf shape, leaf color, breeder, and more. You can add to it and even make it the basis of your
catalog or collection inventory.
 Visit here.

A superb reference source for everything about
garden plant taxonomy, especially nomenclature. This
is an external site but one we very highly recommend.

30+ videos 

Variety Conservation Group (VarCon)
Devoted to propagating, distributing, perserving
documening, and conserving rare and
endangered garden varieties of plants.

Hatch's Cultivars of Woody Plants

Page Counts (PDF 8 x 10 in):
Interface: Paid Data Console
Megabytes: 1400 (14GB)
Taxa Range: all temperate woody plants including trees, shrubs, conifers, vines, hardy palms, and subshrubs.
MIssion Statement: To be and remain the largest  and most complete
catalog of garden trees, shrubs, vines, and conifers ever published in any medium
Subscription Duration: You will receive access to all updates through December 31, 2018.

$49.00 - $89.00 per user from and a menu you can put on your phone, tablet, laptop, or any other internet-enabled device. Click Buy Now from our Paypal checkout site after selecting the Number of Users from the pulldown menu.
Number of Users
Orders prepaid for all users

Hatch's Perennials 2016-2017 is the largest and most complete encyclopedia of hardy herbaceous perennial cultivars ever produced and the newest edition has just been released. Now becoming...

You receive all updates through December 31, 2018

Here's what you get:

  • MORE DATA: more cultivars than everywhere else, more than 2600 PDF 8x10 in. pages and over 380 megabytes. No print publisher would every comprehend sending out this much information. This is only doable and affordable as digital ebooks.
  • AUTHORITATIVE: Horticultural taxonomist Larry Hatch (BS Cornell, MS NC State) has worked on this and collected perennials for more than 35 years and had more than two decades of expert advice from the New Ornamentals Society. 
  • VERSATILE: you can put the entire system on your phone, tablet, laptop, desktop, ebook reader, and other device - anything that reads PDF files. More than 480 devices are supported.
  • EVERYWHERE YOU GO: you have this data wherever you carry your devices in the garden, nursery, botanical garden, classroom, lab, or your client's office. 
  • DUAL MENU: You have using the icon listed above and you also get a separate menu page, both on the web with fast loading.
  • YOU OWN IT FOREVER IN SECURE DIGITAL FORM: If you download the PDF files on your own devices, you have them forever as long as you keep the password (please do). If you decide to purchase updates from our 2018 and future editions, it's up to you to decide when and if you do.
  • ORIGINAL AND EXCLUSIVE: unlike some popular perennial books this is not a crude "compilation" with the pooled ignorance of random interest users unfiltered by experts. HP2016-17 contains decades of original real garden, literature, nursery catalog, and plant trials research. Thousands of observations and data points are exclusive.
  • FREE UPDATES: does your old perennial book author and publishers send you free updates and supplements every month or so? We're! We will. You get all the new data and updated files through 2017 at no extra charge. Your subscription lasts that long.
  • CULTIVAR SPECIFIC DATA: we are very detailed on individual cultivar heights, habit, color, origins, history, leaf traits, and more. 
  • AMAZING, SCREEN-WIDE HIGH-RES IMAGES: from the very beginning Mr. Hatch insisted we publish huge 900 pixel wide images with clarity and lots of digital SLR detail. He even told nurseries and breeders their promotional images were frankly cr@p and modern public relations and scientific documentation (both) deserved better. Today our standard is 1250 pixels wide. No print book publisher could give hundreds of these big, ultra high quality pictures for less than hundreds of dollars in coffee table type books. We do...starting at just $59.00
  • OROC SUPPORT: not only does this work plug into all the new perennial cultivar registrations of the Open Registration of Cultivars project but you subscription directly funds that project. There is absolutely no other organization actively and assertively cataloging new hardy plant cultivars with peer-reviewed standards.
  • ACADEMIC, SCIENTIFIC QUALITY: we include literature citations, university cultivar release notices, expert trial reports, screen prints of classic old catalogs and literature, identification tips, taxonomic notes about related formae, varieties, and subspecies.
  • NO SHIPPING OR CURRENCY CONVERSION COSTS: with our digital delivery you save on handling, packaging, and postal costs. We can't do anything about local taxes. Currency conversion from over 100 countries is usually free and in the old days that could add $8-30 to our orders. Occasionally we pay 30-70 cents and we "eat that" with no worries.
  • YOUR FEEDBACK MATTERS: Mr. Hatch insists on personally receiving and taking action with permission on submissions from all users, including your own new cultivars, images, your observations, comments, corrections, and anything else you can to share. Hundreds of past readers of Hatch's Perennials have sent images and new cultivar descriptions as well as interesting plant histories that became part of this worldwide, shared resource.

This subcription is 100% digital delivery as PDF files and there are no mailed or printed materials. You can view and download the files from two different menu, a standalone page on y click any HP 2016-2017 logo on the three GENUS CENTRAL @ CULTVIAR.ORG pages under each genus.

You will receive a download website page address/URL and password by email, usually within 48 hours of your order, to access your new resource. THIS IS NOT A PRINTED BOOK and we do not mail any content. This is a 100% digital service.
  •  If for any reason Paypal decides to delay, hold, or verify your order, we are required to delay this information until the payment is confirmed. We may not be paid if you have any existing holds or "open cases" with Paypal.
  • If you Paypal email address is outdated we will have no way to reach you. Please update that website or send your order data to with the correct address without delay.

Number of Users

Copyright 2017.
Laurence C. Hatch.
All Rights Reserved.