Thuja 4EVER Cultivar Color Shift and Foliage Retention
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Solution Overview
Problem
There is a need for a distinct cultivar of Thuja plicata that exhibits unique characteristics such as an upright habit, light green leaves that turn yellow below 5 degrees Centigrade, and minimal leaf shedding, which are not found in existing cultivars like 'Zabrina Gold' and 'Martin'.
Innovation Solution
The cultivar '4EVER' is identified, which features an upright growth habit, light green leaves that change color at low temperatures, and low leaf shedding, distinguished by less dense branches and foliage compared to 'Zabrina Gold' and different leaf behavior from 'Martin', with propagation through softwood cuttings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Thuja plicata 'Martin' is used as the base cultivar, then the plant has good adaptability and moderate growth, but the leaves do not change color at low temperatures and the cultivar lacks distinctive ornamental features
Solution Approach 1:
The patent applies parameter changes by selecting and propagating a mutant plant that exhibits a changed physiological response to temperature. The cultivar '4EVER' was discovered as a single plant within a population of Thuja plicata 'Martin' that displayed the unique characteristic of turning yellow below 5 degrees Centigrade, while maintaining the adaptability of the parent cultivar. This natural genetic variation was then stabilized through asexual reproduction by softwood cuttings.
2Reliability
If Thuja plicata 'Zabrina Gold' is used, then the plant has dense branches and yellow foliage, but the foliage is too dense and the color is excessively yellow, reducing ornamental versatility
Solution Approach 1:
The patent applies local quality by creating a cultivar with moderate rather than excessive characteristics. Thuja '4EVER' has light green leaves that turn yellow at low temperatures, providing a subtle color change response compared to the intensely yellow foliage of 'Zabrina Gold'. The branches are less dense, allowing for better light penetration and air circulation while maintaining an attractive conical shape. This moderate expression of traits enhances ornamental versatility for different landscaping applications.
3Duration of action of stationary object
If conventional Thuja cultivars are used, then the plants have established growth patterns, but they exhibit excessive leaf shedding which reduces foliage durability
Solution Approach 1:
The patent applies copying by using asexual reproduction through softwood cuttings to propagate the mutant plant. This method creates genetically identical copies of the original mutant plant that discovered the unique combination of traits: upright habit, light green leaves turning yellow below 5°C, and minimal leaf shedding. Through careful observation and successive generations of asexual reproduction, the unique characteristics have been uniform, stable and reproduced true to type, ensuring consistent foliage retention across all propagated plants.
Data Source
AI summary
A new cultivar of Thuja plant named ‘4EVER’ that is characterized by an upright habit, light green leaves that turn yellow below 5 degrees Centigrade and sheds very few leaves.