Deep Rootrainers provide the ideal start for plants that resent root disturbance, including Sweet Potato slips, Runner Beans, Sweet Peas and Sweetcorn. The deep cells provide extra space for the roots to develop. The cells can be opened and closed again for inspection, using a book mechanism, and limits root disturbance when plants are ready to be transplanted. These sturdy trays can also be used to start trees, shrubs, fruit bushes and herbaceous plants, making them extremely versatile. Made from sturdy recycled plastic, they can be re-used many times over, making them far more environmentally friendly than traditional plastic cells.