Hosta Blue Elf Dwarf Cultivar Glaucous Foliage and Slug Resistance
Solution Overview
Problem
Existing Hosta cultivars lack a combination of compact habit, unique foliage characteristics, and vibrant flower stripes, with most having either smaller leaves, less glaucous coverage, or different flower colors, failing to provide a distinct and visually appealing option for miniature gardens and containers.
Innovation Solution
The development of Hosta 'Blue Elf', a hybrid resulting from crossing 'Blue Mouse Ears' and 'Osiris Obscur', which exhibits rounded, glaucous blue-green leaves, compact habit, and brilliant violet flowers with white stripes, offering a distinct combination of traits including light blue-green foliage that retains color throughout the season and provides slug resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If Hosta cultivars have smaller leaf blades to suit miniature gardens, then they can be used in containers and edging, but they lack sufficient glaucous coverage and visual appeal
Solution Approach 1:
The patent applies parameter changes by selectively breeding for specific quantitative traits: increasing glaucous coverage to 75-90% of the leaf surface area, maintaining leaf blade dimensions of 4-8 cm, and achieving a specific blue-green coloration (RHS 122A-122D). This resolves the contradiction by precisely controlling multiple parameters simultaneously to create a cultivar that is both small enough for containers and visually appealing with sufficient glaucous coverage.
2Volume of moving object
If Hosta cultivars have compact habit for miniature gardens, then they are suitable for containers and edging, but they lack vibrant flower characteristics
Solution Approach 1:
The patent resolves this contradiction by simultaneously controlling multiple parameters: maintaining a compact plant habit of 8-12 inches in height and spread, while producing flowers with brilliant violet coloration (RHS 85A-85D) featuring distinctive white stripes and spots. The flower scape height is specifically controlled at 10-14 inches, and flowers are produced in clusters of 3-6 per scape, ensuring visual appeal within the compact form.
3Strength
If Hosta cultivars have thick leaf substance for durability, then they provide slug resistance, but they reduce overall plant compactness
Solution Approach 1:
The patent resolves this contradiction by precisely controlling leaf substance thickness to provide adequate slug resistance while maintaining overall plant compactness. The leaves are described as having 'moderately thick' substance that is 'substantially planar' with 'slightly undulating' margins, and the entire plant is maintained at 8-12 inches in height and spread. This balanced parameter control achieves both durability and compactness.
Data Source
AI summary
A new and distinct Hosta plant named ‘Blue Elf’ with rounded, glaucous, blue-green leaves having a near white underside. The blue-green leaf coloration remains until near the end of the growing season. The flowers are held on tightly congested scapes just above the foliage. ‘Blue Elf’ has excellent dwarf characteristics and is useful in the miniature garden, as edging or front of the landscape border, in containers, as a specimen or en masse.