Scientific names: G
- Gaillardia aristata
- Gaillardia aristata 'Burgunder'
- Gaillardia x grandiflora 'Kobold'
- Galanthus Atkinsii
- Galanthus S. Arnott
- Galanthus elwesii
- Galanthus ikariae
- Galanthus nivalis
- Galanthus nivalis 'Viridi-Apice'
- Galanthus plicatus
- Galanthus woronowii
- Galega officinalis
- Galega orientalis
- Galeottia negrensis 'Berggarten'
- Galium odoratum
- Galium verum
- Galtonia candicans
- Gardenia augusta
- Gardenia jasminoides
- Gardenia thunbergia
- Garrya elliptica 'Glasnevin Wine'
- Gaultheria mucronata
- Gaultheria procumbens
- Gaura lindheimeri
- Gaura lindheimeri 'Gambit Rose'
- Gazania linearis
- Gazania rigens
- Gazania rigens 'Big Kiss White Flame'
- Genista cinerea
- Genista hispanica
- Genista lydia
- Genista microphylla
- Genista sagittalis
- Genista tinctoria
- Gentiana acaulis
- Gentiana asclepiadea
- Gentiana bavarica
- Gentiana clusii
- Gentiana dendrologi
- Gentiana lutea
- Gentiana paradoxa
- Gentiana scabra
- Gentiana verna
- Gentianella lutescens
- Geranium cinereum 'Ballerina'
- Geranium cinereum 'Guiseppii'
- Geranium cinereum 'Lawrence Flatman'
- Geranium cinereum subsp. subcaulescens
- Geranium dalmaticum
- Geranium endressii
- Geranium himalayense 'Irish Blue'
- Geranium himalayense 'Johnson's Blue'
- Geranium ibericum
- Geranium macrorrhizum
- Geranium macrorrhizum 'Czakor'
- Geranium macrorrhizum 'Spessart'
- Geranium maderense
- Geranium nodosum
- Geranium phaeum
- Geranium phaeum 'Lily Lovell'
- Geranium platypetalum
- Geranium pratense
- Geranium pratense 'Brookside'
- Geranium pratense 'Johnsons Blue'
- Geranium pratense 'Mrs Kendall Clark'
- Geranium pratense 'Splish Splash'
- Geranium procurrens
- Geranium psilostemon
- Geranium psilostemon 'Anne Thomson'
- Geranium psilostemon 'Patricia'
- Geranium pyrenaicum 'Bill Wallis'
- Geranium renardii
- Geranium renardii 'Philippe Vapelle'
- Geranium robertianum
- Geranium sanguineum
- Geranium sanguineum 'Album'
- Geranium sanguineum 'Max Frei'
- Geranium sanguineum 'Nanum'
- Geranium sanguineum 'Tiny Monster'
- Geranium sanguineum var. striatum
- Geranium subcaulescens
- Geranium swatense
- Geranium sylvaticum
- Geranium sylvaticum 'Birch Lilac'
- Geranium sylvaticum 'Mayflower'
- Geranium sylvaticum 'Meran'
- Geranium versicolor
- Geranium wallichianum 'Rozanne'
- Geranium x cantabrigiense 'Biokovo'
- Geranium x magnificum
- Geranium x magnificum 'Rosemoor'
- Geranium x oxonianum 'Hollywood'
- Geranium x oxonianum 'Orkney Cherry'
- Geranium x oxonianum 'Phoebe Noble'
- Geranium x oxonianum 'Rebecca Moss'
- Geranium x oxonianum 'Rödbylund'
- Gerbera Creme Springs
- Gerbera Pink Springs
- Geum chiloense
- Geum coccineum
- Geum coccineum 'Borisii'
- Geum heldreichii 'Georgenberg'
- Geum montanum
- Geum rhodopeum
- Geum rivale
- Geum rivale 'Flames of Passion'
- Geum trifolium
- Gilia capitata
- Gillenia trifoliata
- Ginkgo biloba
- Ginkgo biloba 'Fastigiata Blagon'
- Ginkgo biloba 'Mariken'
- Ginkgo biloba 'Pendula'
- Ginkgo biloba 'Pévé Maribo'
- Ginkgo biloba 'Tubifolia'
- Gladiolus callianthus
- Gladiolus callianthus var. murielae
- Gladiolus communis subsp. byzantinus
- Gladiolus illyricus
- Gladiolus palustris
- Glandularia canadensis
- Glandularia canadensis 'Perfecta'
- Glandularia peruviana 'Lascar Red with Eye'
- Glandularia peruviana 'Vectura Lavender'
- Glaucium acutidentatum
- Glaucium corniculatum
- Glaucium flavum
- Glaux maritima
- Glebionis coronaria var. discolor
- Glebionis segetum
- Glechoma hederacea
- Gleditsia japonica
- Gleditsia triacanthos
- Gleditsia triacanthos 'Sunburst'
- Gleichenia linearis
- Globba winitii
- Globularia bisnagarica
- Globularia meridionalis
- Globularia punctata
- Gloriosa superba
- Glottiphyllum platycarpum
- Gloxinia purpurascens
- Gloxinia sylvatica
- Glycine max
- Glycyrrhiza glabra
- Goethea cauliflora
- Goethea strictiflora
- Gomphrena globosa
- Gomphrena globosa 'Las Vegas Pink'
- Gomphrena globosa 'Purple'
- Gomphrena haageana
- Gomphrena haageana 'Leuchtpunkt'
- Gongora aromatica
- Goniophlebium subauriculatum
- Graptophyllum pictum 'Rosea Variegata'
- Gratiola officinalis
- Grevillea Bonfire
- Grevillea Mason's Hybrid
- Grevillea Poorinda Royal Mantle
- Grevillea asteriscosa
- Grevillea banksii
- Grevillea georgeana
- Grevillea juniperina
- Grevillea lanigera
- Grevillea rosmarinifolia
- Grevillea thelemanniana
- Grevillea vestita
- Greyia sutherlandii
- Gunnera magellanica
- Gunnera manicata
- Guzmania berteroniana
- Guzmania lingulata
- Guzmania monostachia
- Guzmania sanguinea
- Gymnadenia conopsea
- Gymnocalycium saglionis
- Gymnocarpium dryopteris
- Gymnocladus dioicus
- Gymnosporangium fuscum
- Gymnosporangium sabinae
- Gymnostachyum ceylanicum
- Gynostemma pentaphyllum
- Gypsophila paniculata
- Gypsophila paniculata 'Schneeflocke'
- Gypsophila repens 'Pink Star'
- Gypsophila repens 'Rosenschleier'