- AGASTACHE – Report trials, including basic description of the types and varieties of Agastache, bibliography, descriptions, photo (German)
- AGASTACHE - Species growing in Texas – description, reference, Photo herbarium,key to determining the species occurring in the State of Texas – Key to Texas Species (English)
- JAPANESE ANEMONES - The key to determining (RHS) – the key to identifying varieties of Japanese anemones (English)
- ASTER - ASTRA – Autumn Asters – probably the most comprehensive global collection of autumn asters. Old Court Nurseries (Malvern, Worcestershire, England), owned by Paul Picton, author of the famous monograph on astrách, has been for decades specialized in breeding and cultivation aster (English)
- ASTER - How to successfully grow – basic information on the cultivation of autumn asters – asters (English)
- CODONOPSIS – The Codonopis Website – English National Collection, List of species and varieties, classification, photo gallery, literature, List herbarium (English)
- CrosuS – Krokusse – Our favorites – basic information about the crocus, cultivation, species and varieties with photos (German)
- DELPHINIUM – OSTROŽKA – Delphinium Society – English company with links to other Delphinium-companies in Europe (English)
- DELPHINIUM – OSTROŽKA – Dowdeswell´s Delphiniums – New Zealand, firm specialized in the breeding – sale of seeds, history, cultivation, photo gallery (English)
- DELPHINIUM – OSTROŽKA – Blackmore-Langdon – English company founded in 1901, specialized in breeding and begonias ostrožek – a large assortment of varieties, photo gallery (English)
- Dracocephalum - dragonhead – The small Labiatae Collection – species descriptions, varieties, photodocumentation, herbarium items, references (German)
- GERANIUM – KAKOST – Hardy geraniums – National Plant Collection Holder – English National Collection – descriptions, photo, kultivarových register names, Addresses on the plant source (English)
- Helenium - in www.helenium-phlox.
- HELLEBORUS – HELLEBORE – Helleborus Gold Collection - Descriptions of types, varieties and hybrids, Online Shop (German, English, French)
- Hemerocallis - Daylily – American Hemerocallis Society – Glossary of terms related to daylilies, register varieties inc. picture, an extensive list of publications (English)
- Hemerocallis - Daylily – Hemerocallis Europa – texts, contractors, photo gallery, references, literature (English, German)
- HEMEROCALLIS, COUGH – British Hemerocallis and Hosta Society (BHHS) – texts, photo gallery, list of suppliers, collection, disease and. (English)
- HEUCHERA – DLUŽICHA – Primrose Path (Pensylvania, USA) – Page one of the leading companies in breeding, cultivation, descriptions of the varieties with photos (English)
- HEUCHERA – DLUŽICHA – Heuchera at Ohio State Univeristy – a basic description of the genus, cultivation, use, popis semenem množených aj. varieties (English)
- HEUCHERA, x Heucherella, TIARELLA – Hostas & SO - The representation of new varieties of leaf differences, Online Shop (English)
- x Heucherella – Primrose path – basic information, cultivation, further detailed page American Primrose Path Nursery (English)
- GUEST or plantain lily or - Descriptions of botanical species and varieties, photodocumentation, Articles, consulting, sale (česky, slovensky, English,French, Hungarian, Russian, Spanish, Dutch)
- COUGH - BOHYŠKA – American Hosta Society – a glossary of terms relating to funkia, publications, registration varieties (English)
- COUGH - BOHYŠKA – Bowden´s Hostas – Online Hosta Nursery – English national collection (National Plant Collection Holder) – catalog with photographs cultivars (English)
- COUGH – Hosta – Hosta society – overview varieties, partly with photos, publications (Dutch)
- COUGH – Hosta – Cough – Marco Fransen – a company specialized in guests – funkie, extensive catalog - 1000 varieties, photo (Dutch, German, English)
- HYDRANGEA – HORTENZIE (USNA USA) - Descriptions, Hydrangea macrophylla - varieties, other species, photo, cultivation, pests, most common problems (English)
- HYDRANGEA – HORTENZIE – Hydrangeas, hydrangeas! - All of the hydrangea, gallery varieties (English)
- IRIS - KOSATEC – Iris CENTRAL ASSOCIATION - Everything about, Czech register, Slovak and Polish varieties, photo, references (česky, slovensky, Polish)
- IRIS - KOSATEC – American Iris Society – extensive cultivation sites with photo gallery, Medal winners in all categories (English)
- IRIS – KOSATEC – Species Iris Group of North America – Articles, exchange seeds, photo gallery (English)
- LAMIACEAE – HLUCHAVKOVITÉ - The small collection Labiatae – Agastache, Monarda, Dracocephalum, Nepeta – species descriptions, varieties, photodocumentation, herbarium items, references (German)
- LAMIACEAE – Mints of Texas – University of Texas Herbarium – Description of the family Lamiaceae with references, species from the family of the occurrence Texas, enough detail progress, including photographs of herbarium specimens (English)
- LAMIUM MACULATUM - KEY TO THE DETERMINATION OF VARIETY (RHS) - Description of varieties of nettle speckled, with obrázky (English)
- LAVANDULA – National Collections of Lavandula – One of England's national collections lavender, clear classification of species and varieties (English)
- LAVATERA – cultivation, kulivary, photo gallery, key to determining (German)
- LAVATERA – MALVACEAE – cultivation, reproduction, classification, synonymika, photo gallery (English)
- Mata – MENTHA – botanical classification, varieties, quality photos and herbarium items (German)
- MENTHA – Mata – on page Matache, Online Shop (German)
- MENTHA – Mata – Minz Museum Eichenau – Mátové museum Eichenau – cultivation, content substances and therapeutic effects, recipes (German, English)
- MENTHA – MÁTA – Mints at Botanical – different types – synonyms, description, cultivation, use, dosage (English)
- MONARDA – ZAVINUTKA – Texas Species – description, reference, Photo herbarium, key to determining the species occurring in the State of Texas – Key to Texas Species
- MONARDA – Comparison of powdery mildew resistance among bee balm cultivars – assessment varieties for sensitivity to powdery mildew (English)
- Nepeta - Santal – Plant Image Galery – an overview of selected species and varieties SANTI – Nepeta (English)
- PAEONIA – PIVOŇKA – Project Paeonia – Germany – excellent site – descriptions, šlechitelé and photos of more than 1200 species and varieties, literature, references (German, English)
- PAEONIA – National Plant Collection of Paeonia lactiflora (pre 1940 cvs.) - National Birk with herbaceous peonies, varieties cultivated year ago 1940 (English)
- PAEONIA – American Peony Society – primarily texts – cultivation, breeding (English)
- PAEONIA – The Website from Peony friends for Peony friends – Switzerland – history, breeding (German, English)
- PAEONIA – Canadian Paeony Society - Canada, peony catalog with descriptions and photographs of the varieties, (English, French)
- PAPAVER ORIENTALE – Water Meadow Nursery – English national collection of large-flowered perennial poppies (English)
- PENSTEMON – AMERICAN PENSTEMON SOCIETY - growing, varieties Dráčik (English)
- PENSTEMON – descriptions, photo gallery, bibliography (English)
- PHLOX PANICULATA – page of the perennial plamenkách (Phlox paniculata) – cultivation, cultivars, photo gallery (German)
- Phlox paniculata - private database located on pictokon.net, photodocumentation 50 varieties (German)
- Phlox paniculata - www.helenium-phlox.de
- PHYSOSTEGIA – Texas Species – description, reference, Photo herbarium, key to determining the species occurring in the State of Texas – Key to Texas Species (English)
- PRIMULA – PRVOSENKA – American Primrose Society – besides texts also an extensive photo gallery species and cultivars, výměna semen, library, (English)
- SOLIDAGO – Goldenrod – North American species - plants.usda.gov - database, distribution maps, herbarium items or photos (English)
- THYMUS – Thymus National collection Holder – English national collection Thymus, nomenclature, DNA study, natural sites, cultivars (English)
- THYMUS – a clear breakdown of the genus Thymus (English)
- HEUCHERA – DLUŽICHA – Primrose Path
- Tiarella – Primrose Path – cultivation, descriptions of the varieties with photos (Page one of the leading companies in breeding (English)
- TRICYRTIS – National Plant Collection of Tricyrtis – one of England's national collections genus Tricyrtis (English)
- VIOLA – The American Viola Society – comprehensive site with lots of information, key to species identification, history, Articles about cultivated species with descriptions of species and cultivars, photo, Contractors plants and seeds, cultivation, bibliography including Articles, use phials for various purposes (English)
- VIOLA – Violet Society – botanika, species and varieties, photo, cultivation, contractors, company, (English)
- VIOLA – National Viola and Pansy Society – extensive photo gallery and profiles Plant, online newspaper, list of suppliers (English)
- VIOLA – website of the German company Alpine Staudengärtnerei Raritäten, Jürgen Peters One of the specialties of the company are violets – briefly botany, species and varieties, portraits and photographs of plants, linky, on-line katalog with photographs varieties (German)
- VIOLA – All about violets – second, photo, use phials for various purposes (outside the garden), violkové společnosti, power purchase, bibliography, an extensive list of links (German)
- VIOLA ODORATA – Viola odorata at Devon Violet Nursery – English company specialized in violet (Only Viola odorata), range, descriptions, photo (English)
- VIOLA – Canyon Creek Nurseries – American company, One of its specialties is the breeding and multiplication Violet, online catalog with photographs varieties (English)
- VIOLA – Christopher Krucher – hortensis.de – gardening with a wide range Violet (German)
2024
Helleborus