Both are divided into categories. Forestland owners should be aware of those pest plants that can cause harm to their property. They form a dense blanket over everything, climb trees, and displace other plants by smothering them and cutting off light. These plants can become so abundant that their weight will break the stems of shrubs and trees. California to the foothills and redwood forests.
Brooms commonly form impenetrable thickets.
They change the chemistry of the environment by fixing nitrogen and enriching the soil, thus changing the plant community. Gorse is a close relative of the brooms with stiff spines that make them more difficult to remove. Yellow Star Thistle is ubiquitous in California. Once seed set occurs, new plants may emerge for 5 years or more.