I
Last updated October 1, 2009
| Name | Family | Nativity |
| Iberis sempervirens | Brassicacaea | |
| Iberis sempervirens cv. Snow White | Brassicaceae | |
| Iberis sp. | Brassicaceae | |
| Ibervillea sonorae v. peninsularis | Cucurbitaceae | SW North America |
| Ilex aquifolium cv. | Aquifoliaceae | |
| Ilex cornuta cv. Burfordii | Aquifoliaceae | |
| Ilex cornuta cv. Rotunda | Aquifoliaceae | |
| Ilex crenata cv. Convexa | Aquifoliaceae | |
| Ilex opaca cv. Rotundifolia | Aquifoliaceae | |
| Ilex pernyi | Aquifoliaceae | Cen China |
| Ilex sp. | Aquifoliaceae | |
| Impatiens balfourii | Balsaminaceae | W. Himalaya |
| Impatiens balsamina cv. Pink | Balsaminaceae | |
| Impatiens balsamina cv. Red | Balsaminaceae | |
| Impatiens balsamina cv. Violet | Balsaminaceae | |
| Impatiens cv. | Balsaminaceae | |
| Impatiens cv. Orange | Balsaminaceae | |
| Impatiens sodenii | Balsaminaceae | E Tropical Africa |
| Impatiens sp. | Balsaminaceae | Bali |
| Indigofera natalensis | Fabaceae | South Africa |
| Iochroma coccinea | Solanaceae | South American Tropics |
| Iochroma cyaneum | Solanaceae | South America |
| Ipomoea platense | Convolvulaceae | |
| Ipomoea sp. | Convolvulaceae | |
| Iris cv. Frequent Flyer | Iridaceae | |
| Iris cv. Lotusland | Iridaceae | |
| Iris kaempferi | Iridaceae | Japan |
| Iris sp. | Iridaceae | |
| Isolatocereus dumortieri | Cactaceae | Cen Mexico |
| Isopogon formosus | Proteaceae | Western Australia |
| Itea ilicifolia | Iteaceae | China |


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Ganna Walska died March 2, 1984, at Lotusland, leaving her garden and her entire estate to the Ganna Walska Lotusland Foundation, to insure that her legacy would remain in her gardens.