Hosta Sparkler Variegated Foliage Compact Growth
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Solution Overview
Problem
There is a need for a new Hosta cultivar that combines unique characteristics such as stiff, heavy-substance foliage, specific variegation patterns, upright flower scapes, and a compact growth habit, which are not found in existing Hosta cultivars.
Innovation Solution
The development of Hosta 'Sparkler', a naturally occurring mutation of Hosta 'Fireworks', which exhibits thick, rigid leaves with dark green margins and creamy-white centers, produces upright lavender flowers, and has a shorter, more dense growth habit, achieved through asexual propagation by tissue culture and division.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If Hosta 'Fireworks' is used as the parent cultivar, then variegation pattern is achieved, but leaf substance is thin and not rigid
Solution Approach 1:
The patent describes a naturally occurring mutation that changed the physical parameters of the leaf blade, specifically increasing thickness and rigidity while maintaining the variegation pattern. This parameter change resolved the contradiction by transforming the leaf substance from thin to thick without losing the desired variegation characteristics.
2Shape
If Hosta 'Loyalist' is used, then leaf blade is broader and flatter, but plant size is larger and less compact
Solution Approach 1:
The mutation resulted in changed growth parameters that produced a more compact plant form while maintaining the conduplicate leaf blade shape. The plant achieved a smaller overall size with denser foliage, resolving the contradiction between desired leaf shape and excessive plant size.
3Productivity
If Hosta 'Fireworks' is propagated by tissue culture, then genetic stability is achieved, but growth rate is slower
Solution Approach 1:
The patent describes that the mutation was discovered in a tissue culture propagation system and has since been propagated asexually through tissue culture and division. The self-service principle is applied as the plant maintains its unique characteristics through natural asexual propagation methods, achieving both genetic stability and improved growth rate without requiring additional intervention.
4Productivity
If Hosta 'Sparkler' is grown to saleable size, then rapid growth is achieved, but plant reaches compact size quickly limiting further growth
Solution Approach 1:
The patent describes that the plant reaches saleable size in about 5 months from rooted tissue culture plantlet, which is rapid growth. The compact size limitation is actually a desirable trait for the target market, so the partial action principle is applied by optimizing growth to reach commercial viability quickly rather than pursuing maximum size.
Data Source
AI summary
A new and distinct Hosta plant named ‘Sparkler’, characterized by stiff, heavy-substance, thick foliage with conduplicate leaf blades with variegation of white centers and dark green margins and intermediate colors feathered between margin and center. Hosta ‘Sparkler’ flowers with erect cream-colored scapes having upright facing light lavender flowers in mid-July subtended by variegated bracts on a compact plant.