H. ‘Diadem’
Hosta ‘Diadem’ is a registered cultivar () .
| Year registered | 2002 |
|---|---|
| Section class | IV-5b (Small) |
Overview
Registered in 2002, *Hosta* 'Diadem' is a sport of *Hosta* 'King Tut' distinguished by its small, mound-like habit and dark green leaves with narrow, flat golden yellow margins. The leaf margins measure 0.25 to 0.5 inches (0.6 to 1.3 cm) wide, providing a crisp contrast against the dark green blade.
In the Garden
'Diadem' reaches a mature diameter of 16 inches (40.6 cm) and a height of 7 inches (17.8 cm), forming a compact, slow-growing mound suitable for the front of borders, rock gardens, or small-scale woodland plantings. It performs best in partial to full shade, as is typical for hostas, and pairs well with other small cultivars or shade-tolerant perennials such as ferns and heucheras. Its small size also makes it appropriate for container cultivation.
Care Notes
Provide consistent moisture, particularly during dry periods, and apply a balanced, slow-release fertilizer in early spring as new growth emerges. Standard precautions against slugs and deer are advisable, as with most hostas.
Size and leaf
| Clump height | 7 in (17.8 cm) |
|---|---|
| Clump width | 16 in (40.6 cm) |
| Leaf length | 5.5 in (14 cm) |
| Leaf width | 4 in (10.2 cm) |
| Vein pairs | 10 |
| Leaf | dark green with .25 to .5in (0.6 to 1.3cm) wide, golden yellow, flat margins; slightly shiny on top; slightly shiny underneath; lightly corrugated; veined; tips arch downward |
| Flower scape height | 18–24 in (45.7–61.0 cm) |
| Seasonal colour change | green darkens |
| Notable characteristics | dark green with narrow gold margin; good substance |
From the American Hosta Society Registry record.
Parentage
- Sport parent: Sport of H. 'King Tut' — H. ‘King Tut’
Similar cultivars
Other registered hostas in the same AHS section class (IV-5b, small size):
- H. ‘Praying Hands’ (1996)
- H. ‘Autumn Frost’ (2009)
- H. ‘Butter Rim’ (1986)
- H. ‘Anglo Saxon’ (2001)
- H. ‘Glen Tiara’ (2003)
- H. ‘Katie Q’ (2003)
Related guides
Registration data: AHS Registry #1433