Z. Carter

An example of a good or usefull plant would be Yarrow. Yarrow is its common name. Its scientific name would be Achillea millefolium. Yarrow is found in the United Kingdom, Russia, California, Estonia, Ohio, Alabama, and North Dakota. Yarrow can endure dry impoverish soil and survive with little maintenance. Requires full sun to grow and be healthy. Yarrow is a true perennial taking two years to become established. It has a average hieght of about 1 to 3 feet. germination takes about 20 to 45 days. Yarrow is very common along roadsides and old fields, pastures,and meadows in the eastern and central United States and Canada.Yarrow can help plants growing around it also. It improves the health of plants nearby and enhances their essential oil content. It has a single stem that is fibrous and rough. The leaves alternate 3 to 4 inches lon and 1 inch broad. Yarrow is fern-like and dark green with a feathery apperareance. The segments are very finely cut on a yarrow. Yarrow belongs to the Phylum Anthophyta.

An example of a bad or harmful plant would be the Tearthumb. The common name is Tearthumb. Its scientific name is Polygonum sagittatum. You can find Tearthumbs in marshes and wet thickets. Most of these plants have a average height of two to four feet. Its flower size is 1/8 inch across and are mostly pink or white.This plant flowers around june to october. It is a native plant. The Tearthumb uses backward pionting hooks on the stem and leaves to help it climb over other plants. The hooks are also responsible for the name Tearthumb. Arrow tearthumb and halberd-leaved tearthumb can be distinguished by the shape of the leaves. It is a group of annual vining plants. The stems are branching with many prickles turned oppositely from the direction of the stem. This plant also belongs to phylum Anthopyta.

Works Cited

"Arrow Tearthumb (Polygonum Sagittatum)." Connecticut Botanical Society. Web. 14 Feb. 2012. ."Facts about Yarrow - True Knowledge." True Knowledge - the Internet Answer Engine. Web. 14 Feb. 2012. ."Tearthumb." Department of Plant Pathology, Physiology, and Weed Science Virginia Tech. Web. 14 Feb. 2012. ."Yarrow." Aggie Horticulture. Web. 14 Feb. 2012. .