Karen's essay about planting a flower bed. She is using the cooking term trowel, which means a small, handheld tool used for planting " which sentence uses the word trowel correctly

In that essay about a Flower Garden, or planting a flower bed, since a "trowel" is a tool used in gardening to lift the plants, remove soil or make holes in the soil to plant or sow thus the garden grows; given the context, a sentence using that word correctly would be something like:

"I must trowel my garden in order to make it grow".