Holboellia coriacea is an uncommonly-grown vine with thick, glossy, evergreen foliage and clusters of white fragrant flowers.

Holboellia coriacea 'Cathedral Gem' has pendulous clusters of white buds opening to intoxicatingly fragrant flowers.

Huernia zebrina or lifesaver plant produces plastic-like, star-shaped, red and yellow petals with a deep red, lifesaver-like ring.

Hydrangea integrifolia is a rare evergreen climbing hydrangea from Taiwan and the Philippines.

Hymenocallis (Ismene) caribaea is a robust spider lily or Peruvian daffodil with pure white, daffodil-like flowers with a round corona & long thin petals.

Hymenocallis festalis or Peruvian daffodil resembles a pure white, spidery daffodil with nice fragrance.

Hymenocallis harrisiana is a very spider-like species with white flowers with small coronas and narrow petals.

Hymenocallis littoralis is a very spider-like species with white flowers with small coronas and narrow petals.

Hymenocallis 'Zwanenburg’ is noted for having large white flowers that resemble pure white, spidery daffodils with nice fragrance.

The fragrant Carolina spider lily (Hymenocallis caroliniana) resembles a pure white, spidery daffodil.

Hymenocallis (Ismene) 'Advance' resembles a spidery, white daffodil with a round corona, long, thin filaments, yellow stamens, a greenish yellow throat, and stubby, narrow petals.

Hymenocallis (Ismene) 'Sulphur Queen' has spidery, pale yellow, fragrant, daffodil-like flowers with a green throat and stubby, narrow petals.

Iberis sempervirens First Flush 'Lavender' is a candytuft with a long blooming period of bi-coloured lavender and white flowers.

Golden foliage changes to chartreuse green with age. Topped with classic candy tuft white flowers.

Iberis x hybrida Mermaid 'Lavender' is a candytuft with deep lavender flowers.

Iberis 'Sweetheart' is a stunning new colour of flower for the candytufts: lavender! Oh la la!

Ilex crenata 'Mariesii' is a very slow grower. This variety is excellent for bonsai or as a low-maintenance garden specimen.

Ilex crenata 'Sky Pencil' is an incredibly narrow, fastigiate selection of Japanese holly that requires little maintenance.

Iris foetidissima is an evergreen, shade tolerant species with pretty flowers and dramatic displays of orange seeds in autumn.

Iris foetidissima 'Citrina' is an evergreen, shade tolerant species with pretty pale yellow flowers and bright orange seeds in autumn.