Rhododendron ROBLEZN Cultivar Breeding for Repeat Blooming

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Solution Overview

Problem

Existing Rhododendron varieties lack dark flower color, repeat blooming, all-around sturdiness, pest resistance, and adaptability to variable environmental conditions.

Innovation Solution

The development of the Rhododendron cultivar 'ROBLEZN', which features single, self-cleaning flowers with unique red-purple coloring, repeat blooming in spring, summer, and fall, superior landscape qualities, tolerance to pests and environmental conditions, and a strong root system.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing Rhododendron varieties are used, then they may have basic flowering capability, but they lack dark flower color, repeat blooming, sturdiness, and pest resistance

Engineering Contradiction:

Improverepeat blooming and pest resistanceVSAvoidenvironmental adaptability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies parameter changes by selecting and breeding Rhododendron plants with specific genetic parameters that confer dark flower color, repeat blooming capability, and pest resistance. The breeding program systematically modifies plant parameters (genotype) to achieve the desired combination of traits, including dark purple flower coloration, multiple blooming cycles across spring, summer, and fall, and enhanced resilience to environmental conditions and pests.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If new Rhododendron varieties are bred with multiple desirable traits, then plant performance improves, but breeding complexity and time requirements increase

Engineering Contradiction:

Improveplant performance consistencyVSAvoidbreeding program duration

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-selecting and pre-breeding plants with individual desirable traits (dark flower color, repeat blooming, pest resistance) before combining them in the final cultivar development. The breeding program systematically accumulates and stabilizes these traits across multiple generations, allowing the complex multi-trait variety to be developed through staged selection rather than simultaneous development of all traits.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If Rhododendron plants are selected for specific horticultural traits, then commercial value increases, but genetic diversity may be reduced

Engineering Contradiction:

Improvecommercial variety developmentVSAvoidgenetic diversity

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent applies local quality by focusing the breeding program on specific local characteristics (dark flower color, repeat blooming, pest resistance) while maintaining overall genetic health and diversity. The selection process targets particular traits of interest without uniformly applying selection pressure across all genetic parameters, thereby preserving genetic diversity while achieving the desired horticultural improvements.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUSPP36758P2<i>Rhododendron </i>plant named ‘ROBLEZN’

Publication Date: 2025.06.24 PDSI

AI summary

A new and distinct cultivar of Rhododendron plant named ‘Roblezn’ is disclosed, characterized by unique red-purple flowers colored Red-Purple 71A with an overall flush of N74B. Central petal section is irregularly dotted Greyed-Purple N186D. Plants bloom intermittently from early Spring until Fall. Plants have a strong root system, superior landscape qualities and are tolerant of pests. The new cultivar is a Rhododendron, suitable for ornamental garden purposes.