What is NOT significantly enhanced by organic amendments for ornamental plants?

Organic amendments are natural materials added to the soil to improve its structure, nutrient content, and overall health. They play a significant role in enhancing the growth of ornamental plants, promoting vibrant color, improving stress resistance, and aiding in root development.

Growth benefits from organic amendments can be attributed to the enhancement of soil nutrients, moisture retention, and the microbial activity they encourage. They provide essential nutrients slowly over time, which supports healthy plant growth.

Color is also significantly enhanced because many ornamental plants rely on optimal nutrient availability and soil conditions to produce vibrant flowers and foliage. Organic amendments can lead to improved color expression through better nutrient uptake.

Stress resistance is another vital aspect improved by organic amendments. Healthy soil enriched with organic matter can help plants withstand various stresses, such as drought, disease, and pest pressures, by promoting a more robust root system and better nutrient access.

While organic amendments contribute to all the other aspects mentioned, growth is not distinctly considered an area that is "not significantly enhanced." It is more accurate to say that, through the cumulative benefits of organic amendments, growth is usually positively impacted along with other factors.