Identifying Invasive Plant Species

The video tutorial explains the differences between native and invasive plants, highlighting their impact on ecosystems, human health, and the economy. It provides detailed comparisons of various plant pairs, such as English Holly vs. Oregon Grape, Lamium vs. Goutweed, and Himalayan Blackberry vs. Trailing Blackberry. The tutorial also covers Knotweed and its lookalikes, as well as Scentless Chamomile vs. Shasta Daisy, offering insights into identifying these plants based on characteristics like leaves, flowers, and growth patterns.

What is a key characteristic of invasive plants?

• They are always smaller than native plants.

• They are always beneficial to the economy.

• They have been in an ecosystem for thousands of years.

• They often lack natural predators in new environments.

Which plant is native: English Holly or Oregon Grape?

• Neither is native

• Both are native

• Oregon Grape

• English Holly

How can you distinguish Lamium from Goutweed?

• By their root system

• By their flower arrangement and smell

• By their leaf color

• By their height

Which plant has a distinctive unpleasant odor?

• English Holly

• Goutweed

• Oregon Grape

• Lamium

Which blackberry species is invasive?

• Black Raspberry

• All are invasive

• Himalayan Blackberry

• Trailing Blackberry

What is a key difference between Himalayan Blackberry and Black Raspberry leaves?

• Himalayan Blackberry leaves are pinnate.

• Black Raspberry leaves have gray woolly undersides.

• Himalayan Blackberry leaves are egg-shaped with sharp tips.

• Black Raspberry leaves are always larger.

Which plant is known for its large, dense bushes?

• Trailing Blackberry

• Oregon Grape

• Himalayan Blackberry

• Black Raspberry

What is a distinguishing feature of Knotweed stems?

• They are covered in thorns.

• They are always green and smooth.

• They are hollow and resemble bamboo.

• They are solid and woody.

How can you differentiate Knotweed from Red Ocean Dogwood by their flowers?

• Knotweed has plume-like clusters.

• Red Ocean Dogwood has plume-like clusters.

• Knotweed has flat top clusters.

• Both have the same flower arrangement.

What is a characteristic of Scentless Chamomile?

• It has a creeping root system.

• It has finely dissected smooth leaves.

• It is a non-invasive hybrid.

• It has large flowers like the Shasta Daisy.