Achillea 'Peter Cottontail' Breeding for Dense Habit and Long Bloom
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Solution Overview
Problem
There is a need for a new yarrow cultivar that exhibits a unique combination of traits such as a dense mounded habit, large white, predominantly sterile flower heads, and a long flowering period, which are not found in existing cultivars like 'Gipi Whit', 'The Pearl', 'Noblessa', 'Ballerina', and 'Double Diamond'.
Innovation Solution
Achillea 'Peter Cottontail' is developed through a cross between H10-01 and H10-02, characterized by its upright stems, deep green, serrate leaves, heavily-branched flower stems, and prolonged flowering period, achieved through asexual propagation by cuttings, resulting in a stable and true-to-type plant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a yarrow cultivar is bred for large flower heads with predominantly sterile flowers, then the flower head size and petal breadth are improved, but the flowering period duration may be reduced
Solution Approach 1:
The cultivar achieves large flower heads with predominantly sterile flowers while maintaining a long flowering period through specific genetic parameters established during breeding. The sterile flower characteristic and enlarged flower head size are fixed genetic traits that do not compromise the extended flowering duration from mid-June for seven weeks.
2Shape
If a yarrow cultivar is bred for dense mounded habit with medium height, then the plant compactness and aesthetic form are improved, but the stem length may be reduced
Solution Approach 1:
The cultivar exhibits dense mounded habit at the plant level while maintaining sufficient stem length to support large flower heads. The compactness is achieved through branching density and leaf arrangement rather than restricting individual stem elongation, allowing both compact form and adequate flower head elevation.
3Quantity of substance
If a yarrow cultivar produces heavily-branched flower stems with large flower heads, then the floral display density is improved, but the weight of flower stems increases
Solution Approach 1:
The cultivar develops heavily-branched flower stems with multiple large flower heads along the stem length rather than concentrating weight at the apex. This distributed arrangement along the stem continuum reduces mechanical stress and effective weight burden on any single stem section.
Data Source
AI summary
The new and distinct Yarrow plant named Achillea ‘Peter Cottontail’, dense mounded habit, of upright heavily branched stems of medium height; linear, serrate, slightly-glossy, deep-green leaves; heavy flowering of white, predominately sterile flowers in large heads averaging over 100 florets per head beginning in mid-June and continuing for nearly seven weeks. The new plant is useful as a specimen landscape plant, mass planting or cut flower in arrangements.