The proper name for a weed killer. It’s formed from ‘herb’ meaning a plant (from the latin herba meaning a green plant) and ‘icide’ meaning it kills things. So you get insecticide, fungicide, biocide, pesticide, etc.
A plant, larger than a shrub, with a one or occasionally 2 or more clear stems which form a trunk(s). Above the trunk is a system of branches which gradually increase over the years.
A plant in the wrong place. That’s it really, any one plant can be or not be a weed depending where it’s growing, when it’s growing there and most of all who’s looking at it!
A plant with a system of woody stems which branch out and last from one year to the next gradually increasing in size. Ranges from prostate to several metres in height.
These are plants with no woody stems lasting from one year to the next. Some have leaves which persist from one year to the next but by enlarge they die down to the ground at the end of each summer. Hardy perennial grow by spreading horizontally and tend to establish and flower quicker than trees and shrubs.