Heuchera TNHEUNEB Black Leaf Cultivar Cold Tolerance
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Solution Overview
Problem
Existing Heuchera cultivars lack a variety with larger, shinier black leaves, a more rounded leaf shape, and improved cold and sun tolerance, along with a robust mounding habit and excellent vigor.
Innovation Solution
The development of Heuchera 'TNHEUNEB', a new cultivar resulting from a controlled cross between Heuchera 'K963-1' and Heuchera 'K991-2', characterized by brown-black to black colored, medium-large, geranium-like leaves with shallow rounded lobes, very light pink flowers, and excellent cold and sun tolerance, achieved through asexual propagation using tip cuttings and tissue culture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If existing Heuchera cultivars are used, then the plant provides basic foliage coverage, but the leaves are not large enough, not shiny enough, and not black enough
Solution Approach 1:
The patent applies parameter changes by selectively breeding and propagating plants with specific leaf color parameters (brown-black to black), leaf shape parameters (rounded lobes), and leaf size parameters (medium-large). Through controlled cross-pollination and asexual propagation, the cultivar maintains consistent parameter values across generations, resolving the contradiction between achieving desired leaf characteristics and maintaining reliability.
2Shape
If the plant is bred for larger leaves and bigger habit, then the landscape presence is improved, but the cold and sun tolerance may be compromised
Solution Approach 1:
The patent applies local quality by developing a cultivar with specific local adaptations - the leaf morphology (rounded lobes, medium-large size) is optimized for landscape presence in specific locations, while the overall plant physiology maintains cold and sun tolerance through selective breeding. The flowering stem structure and leaf arrangement are locally optimized for light capture and heat dissipation, allowing larger habit without sacrificing hardiness.
3Stability of the object's composition
If asexual propagation is used to maintain consistent characteristics, then the plant traits are preserved, but the propagation complexity increases
Solution Approach 1:
The patent applies copying through asexual propagation methods (cuttings and tissue culture) that create genetic copies of the parent plant, preserving all desired characteristics (leaf color, shape, size, habit) without the variation introduced by sexual reproduction. The tissue culture system creates standardized copies through controlled embryogenesis, while cutting propagation uses stem or leaf segments to produce clones, both methods maintaining trait consistency while requiring controlled propagation protocols.
Data Source
AI summary
A new and distinct Heuchera plant characterized by brown-black to black colored leaves, medium large, geranium-like leaves, very light pink flowers on upright flowering stems, good cold and sun tolerance, a large, mounding habit with excellent crown count, and excellent vigor.