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.
This summary was generated with AI from the registry record and has not been reviewed yet; the registry data on this page is the reference. How we use AI.
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. ‘Anglo Saxon’ (2001)
- H. ‘Glen Tiara’ (2003)
- H. ‘Katie Q’ (2003)
- H. ‘Lakeside Hoola Hoop’ (2003)
- H. ‘Libby’ (2003)
- H. ‘Lorelei’ (2003)
Related guides
Registration data: AHS Registry #1433. How we check this data.