Gardening in restricted spaces Just about any herb or vegetable can be grown in a container. Look for seed packages labeled dwarf, bush, or small if space is limited. The University of Maryland Cooperative Extension recommends media depth of four to six inches for things like leaf greens, Asian greens, mustards, garlic, radish, basil, cilantro, thyme, mint, and marjoram. Salad greens and some herbs have shallow, fibrous root systems and are well suited to shallow containers with a large surface area. Eight to twelve inch pots are ideal for beans, beets, chard, carrots, cabbage, pepper, eggplant, tomato, squash, rosemary, parsley, lavender, and fennel. Pot
Leaf power powers for bounded values of have bounded clique-width, but this is not true of leaf powers with unbounded exponents. A graph is a 2-leaf power if and only if it is the disjoint union of cliques (i.e., a cluster graph). A graph is a 3-leaf power if and only if it is a (bull,dart,gem)-free chordal graph. Based on this characterization and similar ones, 3-leaf powers can be recognized in linear time. Characterizations of 4-leaf powers are given by and , which also enable linear time recognition. For "k" ≥ 5 the recognition problem of "k"-leaf powers is open, and likewise