Hydrangea COF-HM2 Cultivar Heat and Disease Resistance
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Solution Overview
Problem
Hydrangea macrophylla cultivars face challenges in maintaining blue inflorescence color, wiltage in heat, and susceptibility to powdery mildew and Cercospora leaf spot, with existing varieties not consistently reproducing desirable traits across environmental conditions.
Innovation Solution
The cultivar 'COF-HM2' exhibits unique traits such as green to purple-pink inflorescences, thick sepals, heat resistance, and disease resistance, with a compact habit and vigorous growth, differing from parent and comparator varieties in growth rate, propagation ease, and flower color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If aluminum sulfate and blue max treatments are applied to achieve blue inflorescence color, then color change is achieved, but the treatment complexity and cost increase with minimal success
Solution Approach 1:
The patent extracts and eliminates the need for external chemical treatments (aluminum sulfate and blue max) by selecting a natural mutant that inherently produces pink-to-purple inflorescences without requiring aluminum-based blueing processes, thereby simplifying cultivation while ensuring reliable color production
Solution Approach 2:
The cultivar 'COF-HM2' possesses self-service capability for color production through its natural pigmentation genetics, allowing it to maintain pink-to-purple inflorescence color without external chemical intervention or aluminum treatment, making the plant self-sufficient for its desired aesthetic trait
2Productivity
If typical Hydrangea macrophylla are grown in zone 8 heat, then they produce flowers, but the inflorescences wilt and flag in the heat
Solution Approach 1:
The patent applies parameter changes by selecting for altered physiological characteristics in the mutant cultivar that confer heat tolerance, specifically improved inflorescence durability and resistance to wilting in zone 8 temperatures, while maintaining flowering productivity
3Productivity
If Hydrangea macrophylla are grown in powdery mildew and Cercospora conditions, then they produce foliage, but the foliage is susceptible to disease infection and damage
Solution Approach 1:
The patent converts the harmful effect of disease susceptibility into a beneficial trait by selecting for natural disease resistance in the mutant cultivar, transforming what would normally be a vulnerability into a strength that protects foliage health and maintains productivity in diseased environments
4Productivity
If parent variety Hydrangea Greenmantle is propagated, then lavender mauve flowers are produced, but the growth rate is slower and propagation is more difficult compared to the new variety
Solution Approach 1:
The patent uses copying by propagating the superior growth and propagation traits of the mutant 'COF-HM2' through vegetative cuttings, creating multiple identical copies that inherit the faster growth rate and easier propagation characteristics, thereby spreading the improved traits throughout the production population
Data Source
AI summary
A new and distinct cultivar of Hydrangea plant named ‘COF-HM2’ is disclosed, characterized by vigorously growing, compact plants with strong, upright peduncles. Inflorescences are dense mophead with uniquely colored sepals beginning maturing green-purple and maturing pink. Sepals are extremely thick and persist in good condition up to 8 weeks. Fall foliage is a deep red. The new variety is a Hydrangea, normally produced as an ornamental plant.