Plants
- IasomiePhiladelphus virginal
- Iberis AmaraIberis Amara
- iberis sempervirensiberis sempervirens
- Iberis sempervirens 'Schneeflocke'Iberis sempervirens 'Schneeflocke'
- ice cream bean tree
- Ice cream bushBreynia Nivosa 'Rosea Picta'
- Ice PlantCarpobrotus Edulis
- Ice Plant 'Jewel of the Desert' OpalDelosperma 'Jewel of the Desert' Opal
- Ice plant 'Meteor'Sedum spectabile 'Meteor'
- Iceberg roseRosa Rosaceae
- Iceland poppyPapaver nudicaule
- Ilex aquifolium 'Alaska'Ilex aquifolium 'Alaska'
- Ilex aquifolium 'Golden queen'Ilex aquifolium 'Golden queen'
- Ilex Aquifolium 'J.C. Van Tol'Ilex Aquifolium 'J.C. Van Tol'
- Ilex aquifolium cultivarsIlex aquifolium cultivars
- Ilex aquilfolium 'Aureo marginata'Ilex aquilfolium 'Aureo marginata'
- Ilex crenata 'Green Hedge'Ilex crenata 'Green Hedge'
- Ilex crenata golden gemIlex crenata golden gem
- Ilex meserveae "Blue Prince"Ilex meserveae "Blue Prince"
- Imaptients
- ImpatiensImpatiens
- Imperata cylindrica Red BaronImperata cylindrica Red Baron
- Inanda lilyCyrtanthus sanguineus
- Incarvillea delavayiIncarvillea delavayi
- Indian BalsamImpatiens glandulifera
- Indian bean tree, CatalpaCatalpa bignonioides 'Aurea'
- Indian Bean, Bean TreeCatalpa bignoniodes
- Indian Hawthorn 'Delacourii'Rhaphiolepis 'Delacourii'
- Indian Hawthorn 'Snow White'Rhaphiolepis indica 'Snow White'
- Indian Shot Plant 'Striata'Canna 'Striata'
- Indian Shot Plant 'Stuttgart'Canna 'Stuttgart'
- Indian Shot Plant 'Tropicanna'Canna 'Tropicanna'
- Indian Shot Plant, 'Purpurea'Canna indica 'Purpurea'
- Indian-shot Canna indica
- Indigofera heteranthaIndigofera heterantha