Amazon (USA) site or please visit your country's Amazon site, select Books or Kindle, and search for "cultivars hardy perennials".

Copyright 2019, 2020, 2021, 2022, 2023, 2024.
Laurence C. Hatch.
All Rights Reserved.
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Cultivars of Hardy Perennials
2024 Digital PDF Edition
All Volumes

Page Counts (PDF 8.5. x 11 in..): 2000+

Interface: HTML menu viewable on any internet-connected device. Data files are PDF format. They can be copied to and used on any phone, tablet, desktop, or PDF reader with suitable space.

Megabytes: 392 MB

Author: Laurence C. Hatch, horticultural taxonomist and cultvar historian with contributions from more than 14 genus experts and users worldwide.

Images: More than 2500 JPG images in digital, high resolution quality. Our standard is a minumum of 1250 pixels wide whenever possible. New images are added with most updates.

Cultivar Counts: 22 different Acanthus cultivars, 118 Achillea, 14 Acorus, 198 Agapanthus, 70 Agastache, 124 Ajuga, 281 Aquilegia, 47 Arabis, 56 Aspidistra, 197 Astilbe, 86 Baptisia, 86 Bergenia, 27 Brunnera, 362 different cultivars of Campanula, 116 Coreopsis, 66 Cortaderia, 57 Dicentra, 35 Disporum, 172 Echinacea, 177 Epimedium, 53 Eupatorium, 101 hardy Euphorbia, 3 different Farfugium, 49 Festuca, 193 Geum, 432 Heuchera, 221 hardy Hibiscus, 400+ Hosta, 53 different Kniphofia, 187 Leucanthemum, 34 Liatris, 129 Liriope, 103 perennial Lobelia, 68 Lychnis, 121 Mentha, 205 Miscanthus, 36 Molinia, 168 Monarda, 109 Nepeta,102 Ophiopogon, 65 Origanum, 184 Opuntia, 18 different cultivars of Pachysandra, 34 Panicum, 59 Pennisetum, 982 Phlox, 118 Phormium, 25 Physostegia, 24 Plantago, 46 Polygonatum, 113 Pulmonaria, 25 Pyrrosia, 65 Ranunculus, 31 Rodgersia, 147 Rohdea,39 different cultivars of Thalictrum, 85 Tiarella, 98 hardy Tradescantia, 57 Tricyrtis, 135 Trillium, 56 Trollius, Uvularia=7, 113 Verbascum, 391 Verbena (most hardy USDA 6-7+)=391, 13 Vernonia, 165 Veronica, 71 Vinca, and 107 Yucca.

Taxa Range: All ornamental and hardy herbaceous perennials to USDA zone 7, including some marginals where hardiness may vary by cultivar or strain. Tender herbaceous plants only hardy in USDA zones 8-10 only are covered in Hatch's Interior Plants (HIP) and that volume is free from a link to the right.

Access Rights: this is a private, subscription-only website so the URL must not be shared with others or posted for public use unless you purchase a Library license for single building use.

Downloads: you may download any of the PDF files for your personal use on multiple devices so long as only you the subscriber accesses them. These files are yours for life and do not expire just like a print book. However, it is your responsability to keep the password as we cannot supply lost, old ones after the term of your subscription.

MIssion Statement: To be and remain the largest  and most complete catalog of horticultural varieties or cultivars of hardy herbaceous, garden perennials ever published in any medium.

Subscription Duration: You will receive access to all updates through December 31, 2024

$69.00 (digital download only - nothing is printed or mailed)

To order: email with "CHPER 2024" in the subject line if you use an ad- or popup-blocker. We will invoice you via Paypal. If you don't have a blocker, please use the Paypal buttons below.

 Goto your country's Amazon site, selected Books, and search for "houseplant cultivars".

Taxonomy Of Ornamental Plants (TOOP) by Laurence Hatch

Fourth Edition available mid 2024

We are thrilled to announce that a much expanded, updated version of TOOP is now available as a digital textbook on Amazon. This substantial reference is now 190 pages. The first three editions were distributed privately among subscribers to receive feedback, corrections, and additions. Numerous updates were made from more than thirty people submitting comments and many times questions they had on the subject. We've added much more material, new images, and discussion of literature as recent as 2023. This dramatically expanded Fourth Edition is now available to the general public as a stand-alone ebook.

This reference makes a very useful textbook for a specialized university or botanic garden course. It is not a basic guide to plant taxonomy and assumes intermediate knowledge of that subject. Our emphasis is at the cultivar level but also includes practical examples for identifying and delimiting cultivated species.

This text is part of our extensive training for OROC (Open Registration Of Cultivars) and these persons upon completion of our curriculum and an exam become Certified Registrars. 

Advanced discussion of the taxonomy of ornamental landscape and ornamental interior plants with reference to the following topics:

1. Cultivar fingerprinting with extensive literature review and links
2. Cultivar documentation, registration, and nomenclatural standards
3. Identification methods from traditional to computer-assisted AI
4. Extensive review of classic and recent literature (with links)
5. Phyllometrics, florimetrics, cladometrics, and other biometric methods (with examples)
6. Horticultural monographs, specialty websites, dissertations, and theses
7. Trademarks in nomenclature
8. Colorimetric (color description) systems and other descriptors
9. Formation of cultivars, cloning, recloning, clonification, seedage decline, imposter clones
10. Function of cultivar groups in taxonomy
11. Cytotaxonomy and genetics
12. "Live herbarium" using digital imaging and flatbed scanners
13. Characterization of leaf variegation
14. Modern and practical keys to garden taxa
15. Taxonomic understanding of transgenic and GMO ornamentals
16. Radical taxonomic concepts applied to garden plants (cultons, clades)

Price: PDF digital $69.00

Orders:  TBA

Discounts: For classroom orders we will offer copies at $49.00 each with a minimum purchase of 10 copies paid for as one invoiced order. You may "store" those digital rights until 10 class members are available for distribution to them. Library access is not available at this time.

Use Guidelines: each subscription or "purchase" entitles a single, named user to access the book on their devices. Only one person may be access the book.


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Species name or parentage:
Cultivar name:
Plant type (woody, herbaceous perennial, interior tropical, aquatic, etc.)
Trademark name (if any):
Originator (who discovered or bred it):
Nominant (who named it):
Registrant (who is submitting this form):
Method of development (seedling selection, controlled cross, sport, etc.)
Introduction nursery or agency:
Website for information:
Website for plant sales:
Literature citation (if already published):
Year selected or bred:
Year introduced and location:
Height x width (10 years if woody plant)
Habit or form:
Flower color (adjectives, RHS or Pantone values)
Flower shape:
Leaf color (
adjectives, RHS or Pantone values):
Leaf luster (glossy, matte, semi-glossy):
Leaf shape (ovate, elliptic, linear, etc):
Leaf margins (entire, serrate, dentate, etc)
Leaf texture (flat, bullate, rugose, undulate, etc):
Unique or special morphology:
Landscape adaption (if special):
Disease and pest resistances (and name the species please):
Genetics or ploidy level (if notable):
Compare to similar cultivar A (name it):
Compare to similar cultivar B (name it):
Unique nature of this introduction and why it is important: