Borage has so many functions in the garden. It works as a repellant of detrimental pests, such as hornworms, it attracts pollinating insects and is a great companion plant for tomatoes, squashes and strawberries. The flowers are edible and has a flavor reminiscent of cucumbers. Because of its quick growth patterns, it's a great chop-and-drop mulch addition to the garden. Leaves accumulate growth hormones because, which are released to other plants when laid down as mulch.