Click here to view the lesson plan (pdf).

Grade: 6 to 8

Introduction

Weeds are extremely difficult to eradicate once they become established. It is more practical and cost effective to prevent weeds from entering an area than trying to control weeds after they invade.

Students will learn about common weed situations they and their families are likely to encounter. Students will learn how they and their families can exercise some control in these situations and prevent the spread of weeds.

Students will learn responsible action by discussing and putting into practice weed prevention strategies. By sharing their knowledge with others, students will expand their influence on the spread of invasive plants within their community. Before teaching this lesson, read the entire lesson and make sure all materials are available.

Click here to view the lesson plan (pdf).

Grade: 6 to 8

Introduction

Invasive weed species produce large numbers of seed, are suited to a variety of habitats, and may benefit from several methods of dispersal. Students will learn about seed dispersal. By collecting, inspecting, and allowing seeds to germinate, students will understand that human activities are one of the leading contributors to weed dispersal.

It is best to conduct the Activity in the fall when weed seeds are available. Before teaching this lesson, read the entire lesson and make sure all materials are available.

Click here to view the lesson plan (pdf).

Grade: 6 to 9

Introduction

Every state has laws governing the percentage of weed seed that may be present in the grass seed we purchase and the crop seed that farmers purchase. Certified seed meets the state requirements. For example, wild oat seed is a noxious weed. In the state of Oregon, there may be no more than 45 wild oat seeds per pound of grain seed. Similar laws apply to grass seed that we purchase for lawns and wildflower mixes that we purchase for decorative purposes.

To reduce the risk or prevent invasions of noxious species, it is important that products include accurate information on labels. Labels should indicate the percentage of weed seed (contamination level) and the type of weed seed that might be present in the product. Students will examine seed package labels and compare the label information to the package contents. Before teaching this lesson, read the entire lesson and make sure all materials are available.