Everillo Carex Cultivar Solid Yellow Foliage Compact Growth
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Solution Overview
Problem
There is a lack of ornamental grass cultivars with solid yellow foliage, as existing Carex oshimensis cultivars either lack this trait or grow into larger plants with different characteristics.
Innovation Solution
A new cultivar, 'Everillo', is introduced, which exhibits uniformly yellow foliage, a compact clumping habit, and is hardy in U.S.D.A. Zones 6 to 9, propagated by rhizome division and basal cuttings, resembling Carex elata but with a smaller mature size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If Carex oshimensis cultivars are used for ornamental purposes, then they provide foliage for landscaping, but they lack solid yellow foliage or grow into larger plants with different characteristics
Solution Approach 1:
The patent applies parameter changes by selecting for a specific phenotypic variation (solid yellow foliage) in Carex oshimensis that differs from the typical variegated pattern of parent cultivars. This natural mutation represents a change in the coloration parameter, creating a distinct cultivar with uniform solid yellow foliage rather than the conventional green-and-yellow variegated pattern, thereby filling the gap in the market for solid yellow ornamental grasses.
2Illumination intensity
If existing Carex cultivars with yellow foliage are used, then they provide yellow color, but they develop into larger sized plants
Solution Approach 1:
The patent applies local quality by maintaining the desirable solid yellow foliage coloration while preserving the compact growth habit of the parent Carex oshimensis 'Evergold' cultivar. The selected mutation exhibits intense yellow coloration in the leaves while the overall plant size remains controlled (45-60 cm height, 30-45 cm spread), unlike larger Carex elata species that also have yellow foliage. This creates a localized improvement in color intensity without the unwanted side effect of increased plant volume.
3Manufacturing precision
If a new cultivar with solid yellow foliage is developed, then it provides unique coloration, but propagation stability must be ensured
Solution Approach 1:
The patent applies self-service by utilizing natural vegetative propagation mechanisms of Carex oshimensis through rhizome division and stolons to reproduce the solid yellow foliage trait. The cultivar 'Everillo' propagates true-to-type through these natural asexual reproduction methods, with the solid yellow coloration and compact growth habit being reliably transmitted to offspring without requiring complex intervention, thereby ensuring both color consistency and propagation stability.
Data Source
AI summary
A new cultivar of Carex oshimensis, ‘Everillo’, characterized its foliage that is uniformly yellow in color, its compact clump-forming growth habit, its ability to be readily propagated by rhizome division and basal cuttings, and its hardiness at least in U.S.D.A. Zones 6 to 9.