Landscaping contractors execute lawn, garden and hardscaping plans that have been drawn up by an architect or designer. They may also provide design services on their own. After everything has been installed, landscape companies can make adjustments, maintain plantings, take care of weeds and pests, and perform other tasks to keep the scheme looking its best. A licensed landscaper should have detailed knowledge of weather and climate trends and conditions, and can choose plants and materials that are well suited to the area. Residential landscape companies also handle many of the same general duties as builders, including arranging for construction permits, hiring subcontractors and making sure that designs comply with building codes.