Herb farm and root disease. Successful management of plant diseases include environmental controls similar to that of the pest management plan. Chemical means are determined based on the type of plant disease present in the herb. Herb plants can be started from seed or purchased as a seedling. Common herbs grown from seed are basil, flat and curly leaved parsley, chives, dill, sage, thyme, rosemary, cilantro. Herbs can also be grown via vegetative means, rooting cuttings, division of the plant, bulbs, or tissue culture. The advantage of growing via a vegetative process gives you a plant that is exactly identical to the
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