Penstemon YAPRUBY Cultivar Breeding for Compact Growth
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Solution Overview
Problem
Existing Penstemon cultivars lack desirable traits such as good basal branching, short branch internodes, and extended blooming periods, which limits their garden and container use potential.
Innovation Solution
The development of the Penstemon cultivar 'YAPRUBY' with ruby red flowers, short flowering stems, symmetrical outward-facing blooms, and robust basal branching, achieved through controlled breeding and asexual propagation by stem cuttings, resulting in a compact, long-blooming, and disease-resistant herbaceous perennial.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional Penstemon cultivars are used, then they have simpler growth habits, but they lack good basal branching and have long branch internodes resulting in poor compactness
Solution Approach 1:
The patent applies parameter changes by selectively breeding for specific morphological parameters: shortening branch internode length and modifying basal branching patterns. The cultivar 'YAPRUBY' exhibits internodes of 1-2 cm (compared to typical longer internodes in species) and a specific basal branching architecture that creates compactness, representing deliberate parameter optimization to resolve the contradiction between simple growth habit and compact form.
2Duration of action of moving object
If conventional Penstemon cultivars are used, then they have shorter blooming periods, but they require less complex breeding programs
Solution Approach 1:
The patent implements preliminary action through a systematic, multi-generational breeding program that pre-selects and stabilizes traits before commercial release. The development involved crossing specific parents (Penstemon digitalis 'Early Sparkler' × Penstemon hirsutus), selecting superior offspring, and propagating through controlled asexual methods to ensure trait stability. This preliminary, structured approach extended the blooming period to 90-120 days while managing the inherent complexity of the breeding process.
3Shape
If Penstemon cultivars with outward-facing symmetrical blooms are developed, then aesthetic appeal is enhanced, but flower orientation control becomes more difficult
Solution Approach 1:
The patent applies self-service by selecting for intrinsic floral morphological traits that naturally produce the desired orientation without requiring external control mechanisms. The cultivar 'YAPRUBY' exhibits flowers with symmetrical, outward-facing orientation that is genetically determined and consistently expressed across all plants. This self-determined floral architecture eliminates the need for manual orientation control, resolving the contradiction between enhanced aesthetics and ease of operation.
Data Source
AI summary
A new cultivar of interspecific Penstemon plant named ‘YAPRUBY’ that is characterized by its flowers that are ruby red with a white throat, its flowers that are outward facing and presented symmetrically on the flowering stem, its short flowering stems with short internode lengths, good basal branching resulting in repeat flowering and its seedpods that remain green for a long period and up to frost.