Hydrangea Cultivar H217904 Compact Habit Double Flowers
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Solution Overview
Problem
Current Hydrangea macrophylla cultivars lack compact, freely-branching varieties with large, double-type sterile flowers and good post-production longevity, which are desirable for horticultural applications.
Innovation Solution
A new cultivar, 'H217904', resulting from a cross-pollination between proprietary selections of Hydrangea macrophylla, exhibits a compact, upright habit, vigorous growth, and semi-lacecap inflorescences with intense red-purple double-type sterile flowers, offering improved branching and flower longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If traditional Hydrangea macrophylla cultivars are used, then they have established growth patterns, but they lack compact, freely-branching habits with large double-type sterile flowers
Solution Approach 1:
The breeding program segmented the complex trait requirements into distinct parental contributions: one parent provided compact habit and branching structure, while the other contributed large sterile flowers. This segmentation allowed systematic combination of desirable traits through controlled cross-pollination, resolving the contradiction between maintaining stable growth patterns and achieving novel inflorescence characteristics.
Solution Approach 2:
The invention changed key botanical parameters through selective breeding: plant height was reduced to create compact forms, branch density was increased for freely-branching habits, and flower morphology was modified to produce double-type sterile flowers with multiple whorls. These parameter changes transformed traditional cultivar characteristics into the desired compact, floriferous phenotype.
2Volume of moving object
If Hydrangea cultivars are bred for large inflorescences, then flower size increases, but postproduction longevity may be compromised
Solution Approach 1:
The breeding program applied local quality by selecting for specific traits in different plant parts: compact overall plant habit with vigorously flowering zones, and specifically large double-type sterile flowers with multiple whorls of sepals. This localized selection allowed large inflorescences to be achieved without compromising the structural integrity and longevity of the entire plant.
3Length of moving object
If Hydrangea plants are bred for compact habit, then plant size is reduced, but branching freedom and stem strength may be limited
Solution Approach 1:
The breeding program introduced dynamic balance between compactness and strength: plants were selected for reduced height (compact habit) while simultaneously maintaining vigorously branching capacity and strong stem development. This dynamic optimization allowed the plant to achieve space-efficient growth without sacrificing structural support or flowering potential.
Data Source
AI summary
A new and distinct cultivar of Hydrangea plant named ‘H217904’, characterized by its compact, upright and rounded plant habit; vigorous growth habit and moderate growth rate; freely branching habit with strong, thick and sturdy stems; early and freely flowering habit; semi-lacecap type inflorescences with numerous double-type sterile flowers that are intense red purple in color; and good postproduction longevity.