Do you think they are interchangeable and we can collate with them certain plants?
Which one is used commonly in daily life ?
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To me, with regards to plants, to prune has a feeling of purposely and carefully cutting off the branches to make the plant grow better. To shear doesn't directly apply to plants, it applies to cutting wool from sheep or perhaps hair from my own head. It also has the feel of two surfaces gliding by each other, like how scissors work. To cut back is close to prune, but has the feel of not being nearly as careful about how you accomplish the cutting. I would prune a plant with small scissors, but would cut back the large bush with a chainsaw or machette.
In every day life, I have used both prune and cut back in regards to plants, but they also apply to other words as well. For example: I have heard of both pruning and cutting back jobs as a polite, round aobut way of saying people were laid off in order for the company to continue to grow, where pruning to me sounds a little more polite.
One final tidbit here: Another, older name for scissors is shears, from where the verb originates, but that noun I would only expect from older people or perhaps people who cut hair for a living, not in every day conversation.