Why Hemp Plants With Related Genetics Can Look and Grow Differently

Published: September 2026
Author: Ray Osmolski, Founder — Illinois Hemp & Seed Co., LLC

Welcome

Have you ever noticed that two hemp plants grown from seeds in the same package can look different?

One may grow taller. Another may develop more branches. One may mature earlier, while another develops a different aroma or flower structure.

These differences introduce us to an important concept in plant science:

Phenotype.

Understanding phenotype helps growers observe plants more carefully, helps breeders evaluate characteristics, and helps explain why genetics alone do not tell the entire story of how a plant will develop.

What Is Phenotype?

A phenotype is an observable or measurable characteristic of an organism.

In hemp, phenotype can include characteristics such as:

* Plant height and overall structure
* Branching patterns
* Leaf shape and color
* Flower structure
* Growth rate and maturity
* Aroma
* Seed production
* Cannabinoid and terpene profiles

Some characteristics are easy to observe with your eyes. Others, such as cannabinoid concentrations, require laboratory testing.

A plant’s phenotype develops through the interaction of its genetic makeup, its environment, and the way those factors influence one another.

Genetics provides the potential. Environment influences how that potential is expressed.

Genotype vs. Phenotype

These two terms are closely related, but they mean different things.

Genotype refers to a plant’s genetic makeup—the inherited information it carries.

Phenotype refers to the characteristics the plant actually expresses.

For example, a plant may inherit genetic factors associated with tall growth. Whether it reaches its potential height can also depend on sunlight, water, nutrients, temperature, growing space, and other conditions.

Two plants can have similar genetics but develop different appearances when grown in different environments.

Likewise, two plants can look similar while carrying different combinations of genetic information.

What a plant looks like does not reveal its entire genetic makeup.

Why Can Seeds From the Same Parents Produce Different Plants?

During sexual reproduction, offspring inherit genetic material from their parents.

That genetic material is reshuffled and combined in new ways. As a result, seeds from the same two parents are generally related but not genetically identical.

One seedling may inherit a combination of genetic factors associated with taller growth. Another may inherit a combination associated with a more compact structure.

This variation is a normal part of sexual reproduction.

It is also one reason regular seed populations can be valuable to plant breeders and researchers.

Each seed may offer an opportunity to observe a different combination of inherited characteristics.

How Does the Environment Affect Phenotype?

A plant’s environment can influence how its characteristics develop.

Important environmental factors include:

Light: The amount, intensity, and duration of light can influence plant growth and development.

Temperature: Temperature can affect growth rate, development, and plant responses to stress.

Water: Too little or too much water can influence plant size, vigor, and overall development.

Nutrients: Nutrient availability can affect growth, leaf color, and other characteristics.

Soil and growing conditions: Root-zone conditions, drainage, and growing space can influence plant performance.

Plant stress: Environmental stress can change how a plant develops and expresses certain characteristics.

These factors help explain why the same genetic line may perform differently in different locations or growing seasons.

However, environmental differences do not automatically explain every difference between plants. Genetic variation may also be involved.

A Simple Example: Two Related Hemp Plants

Imagine planting two regular hemp seeds from the same parent population.

Both receive appropriate care, but as they grow, you notice differences.

Plant A develops a taller structure with longer spaces between branches.

Plant B remains shorter and develops a more compact branching pattern.

These differences are examples of phenotype.

They may reflect differences in the genetic information inherited by each plant, differences in their growing environments, or a combination of both.

A single observation cannot establish exactly which factors caused the differences.

That is why breeders observe plants carefully and, when possible, evaluate related plants across multiple growing conditions and generations.

What Is Phenotype Selection?

Phenotype selection is the process of choosing plants based on observable or measurable characteristics.

A breeder might be interested in characteristics such as:

* Earlier maturity
* Particular plant structures
* Seed production
* Fiber characteristics
* Aroma or color
* Adaptation to specific growing conditions
* Particular cannabinoid or terpene profiles

Selecting a plant because it displays a desirable characteristic is only the beginning.

A desirable phenotype does not guarantee that the same characteristic will appear consistently in its offspring.

Breeders may need to evaluate additional generations to understand how reliably a characteristic is inherited.

Environmental influences, genetic complexity, and the characteristics of both parents can all affect the results.

What Does It Mean to Stabilize a Genetic Line?

In plant breeding, people sometimes describe a line as stable when certain characteristics appear consistently across generations.

Developing that consistency generally requires deliberate selection, breeding, evaluation, and record-keeping.

A named seed line is not automatically genetically uniform.

Some lines may contain considerable variation, while others may have been selected for more consistent expression of particular characteristics.

The degree of uniformity depends on the population’s breeding history and the characteristics being evaluated.

This is one reason accurate descriptions matter when discussing hemp genetics.

Phenotype and Clones

Clones provide another useful way to understand the relationship between genetics and environment.

A clone is produced from an existing plant through vegetative propagation.

Clones from the same source plant generally share the same genotype, apart from mutations or other changes that may occur.

However, genetically matching clones can still develop different phenotypes when grown under different conditions.

For example, differences in light, temperature, water, or nutrition may influence their size and appearance.

This demonstrates an important principle:

Even plants with nearly identical genetic information do not necessarily develop identical characteristics in every environment.

Why Phenotype Matters to Genetic Preservation

Genetic preservation involves more than keeping seeds in storage.

It also involves understanding the characteristics represented within a plant population.

When growers and breeders document different phenotypes, they create a record of the variation present in that population.

Those observations may help future generations understand which characteristics were present and how plants performed under particular conditions.

For genetic preservation, useful records may include the seed line, parentage when known, growing conditions, dates, observations, photographs, and relevant laboratory results.

Good documentation helps preserve knowledge alongside the seeds themselves.

Phenotype and Land of Lincoln (LOL)® Genetics

At Hippie Seeds, our interest in hemp genetics includes the diversity that can be found within seed populations.

Our Land of Lincoln (LOL)® seeds are regular seeds, meaning they can produce both male and female plants.

As plants develop, growers may observe differences in characteristics such as structure, branching, maturity, color, and other traits.

Those observations are part of understanding phenotype.

We believe documenting and preserving genetic diversity is an important part of maintaining hemp genetics for future generations.

A seed carries inherited information.

The plant that grows from it gives us an opportunity to observe how that information is expressed.

Key Takeaways

Phenotype describes the observable or measurable characteristics of a plant.

Genotype describes its genetic makeup.

Phenotype develops through interactions between genetics and the environment.

Seeds from the same parents are generally related but not genetically identical.

A desirable phenotype does not guarantee that the same characteristic will appear consistently in future generations.

Careful observation and record-keeping help breeders and researchers understand plant variation and support genetic preservation.

Our Mission

Preserving Hemp Genetics. Educating Growers. Building the Future.

At Hippie Seeds, we believe understanding the differences between plants is an important step toward appreciating and preserving hemp genetic diversity.

Every seed carries genetic information, and every growing plant offers an opportunity to learn.

Continue Your Hemp Journey

What Are Hemp Genetics? — Return to the foundation of this series.

Regular vs. Feminized Seeds — Understand how seed types differ.

Seed Preservation — Learn why protecting seed viability and genetic diversity matters.

Land of Lincoln (LOL)® Genetics — Explore our genetic preservation story.

Common Hemp Terminology — Review important words and definitions.

About Hippie Seeds

Hippie Seeds, a division of Illinois Hemp & Seed Co., LLC, is dedicated to preserving hemp genetics, supporting education, and building a trusted resource for growers, researchers, collectors, and anyone interested in learning about hemp.

Educational Disclaimer: This article is provided for general educational purposes. Plant characteristics are influenced by complex genetic and environmental factors. Observations of individual plants do not guarantee the characteristics of their offspring or establish compliance with applicable hemp regulations.