Global warming makes aggressive plants even stronger - study

It's about the unexpected consequences of global warming.

Details

The study centred on goldenseal, a common plant that can quickly take over territories.

Its growth is usually inhibited by insects that lay eggs in the plant's tissues. This causes growths (galls) to form, which reduces growth and the ability to reproduce.

The scientists conducted an experiment simulating future climatic conditions:

• increased temperature
• drought
• a combination of these factors

It turned out that with warming temperatures, the insects' negative effect is weakened.

For example:

• plants with damage were no longer stunted
• their height increased
• they produced more seeds
• their total weight even exceeded that of the "healthy" plants

When heat and drought combined, the effect was even stronger.

Why it matters

The results show that climate change not only affects individual species, but also their interactions.

The scientists note:

• warming can enhance dominant species
• it can reduce biodiversity
• it is important to consider the links between species, rather than looking at them separately

Such changes could cause some plants to start displacing others even faster.

Background

Goldenseal is known as an aggressive plant that spreads rapidly and suppresses the growth of neighbouring species.

Previously, insects were thought to partially inhibit this process.

Source

The study is based on field experiments modelling warming and drought in US ecosystems. The work is published in Oecologia (2026).