CSLB C-27 Landscaping ContractorPlanting and LandscapingEasy
A landscape technician is identifying common annual weeds in a newly planted flower bed. Which of the following visual characteristics is most indicative of a broadleaf annual weed, as opposed to a grassy annual weed?
- ALeaves with a network of branched veins and typically wider blades.
- BLong, narrow leaves with parallel veins.
- CGrowing in dense clumps with upright growth.
- DA fibrous root system and hollow stems.
Show answer & explanationAnswer & explanation
Correct answer: A. Leaves with a network of branched veins and typically wider blades.
Broadleaf weeds are characterized by leaves that are generally wider and have a network of branched veins, often resembling a net. Grassy weeds, in contrast, have long, narrow leaves with parallel veins.
Why the other options are wrong
- B. Long, narrow leaves with parallel veins are characteristic of grassy weeds (monocots).
- C. Both grassy and broadleaf weeds can grow in dense clumps, so this is not a distinguishing characteristic between the two categories.
- D. A fibrous root system and hollow stems are common characteristics of many grasses, not broadleaf weeds.
Broadleaf vs. Grassy Weeds
Distinguishing characteristics between broadleaf weeds (dicots) and grassy weeds (monocots), important for proper identification and targeted herbicide application.
- Broadleaf weeds have wide leaves with branched (netted) veins.
- Grassy weeds have narrow leaves with parallel veins.
- Broadleaf weeds often have taproots, while grassy weeds have fibrous roots.
- Different herbicides are often used for each type.
Memory trick: Weed's Leaf Clues: Broad has a network, Grass is a line!