Penstemon Cultivar TNPENDV Breeding for Compact Height and Seasonal Foliage Color
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Solution Overview
Problem
There is a need for a compact, hardy, and visually distinct Penstemon cultivar with bi-color flowers and unique foliage characteristics that can thrive in full sun conditions, offering improved vigor and cold hardiness compared to existing varieties.
Innovation Solution
A new Penstemon cultivar, 'TNPENDV' or Dakota™ Verde, characterized by dark green leaves that tint purple in winter, lavender to violet flowers, a short and compact upright habit, attractive deep purple seed heads, and excellent vigor, achieved through controlled breeding and propagated via asexual methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If Penstemon digitalis is used as a reference variety, then the plant has white flowers and green foliage, but the new cultivar achieves lavender to violet flowers with purple-tinted foliage for enhanced visual distinction
Solution Approach 1:
The breeding process modified the foliage color parameter from green to purple-tinted through selective crossbreeding, creating a distinct visual characteristic that differentiates the cultivar while maintaining the plant's overall structure and growth habits
Solution Approach 2:
The invention specifically targets color modification in both flowers (white to lavender-violet) and foliage (green to purple-tinted), using these chromatic changes as the primary means of creating a visually distinct cultivar with enhanced ornamental value
2Adaptability or versatility
If existing Penstemon varieties are used, then the plants have varying heights, but the new cultivar achieves a compact 12-inch height for improved suitability in border plantings
Solution Approach 1:
The breeding program selectively modified the height parameter to achieve a compact 12-inch stature, making the cultivar particularly suitable for border plantings and container gardens where space efficiency is important, while maintaining vigorous growth habits
3Reliability
If Penstemon varieties with dark purple foliage are used, then the foliage color is distinctive, but the new cultivar achieves green foliage with purple tint only in winter for seasonal visual interest
Solution Approach 1:
The foliage color characteristic is dynamic rather than static - green during the growing season and purple-tinted in winter, providing seasonal visual interest while the plant maintains reliable cold hardiness suitable for USDA zones 3-8
Solution Approach 2:
The purple tint appears specifically in winter conditions rather than year-round, creating a localized temporal characteristic that provides seasonal contrast without requiring the plant to maintain distinctive coloring under all conditions
Data Source
AI summary
A new and distinct cultivar of Penstemon plant characterized by dark green leaves, tinted purple with winter temperatures, lavender to violet flowers, short, a compact, upright and well branched habit, attractive deep purple seed heads, and excellent vigor.