The basic nutrients needed in any hydroponic solution are potassium phosphate, potassium nitrate, calcium nitrate and magnesium sulfate. All of these salts must be thoroughly dissolved before being allowed to circulate around your root systems. Micronutrients are also needed for proper growth of your plants. Identifying the spider mites will be easier if you use a garden microscope, which will give you a better view of the tiny bugs. Many think using pesticides to eliminate spider mites in their hydroponic gardens is a good idea, but the use of pesticides in hydroponic gardening is discouraged and usually not necessary. There are many reasons for the drastic differences between hydroponic and soil plants. Root growth is stimulated in the hydroponic plants due to the extra oxygen. Plants with plenty of oxygen in the root system will also absorb nutrients faster. The nutrients in a hydroponic system are mixed with water and sent directly to the root system. Many gardeners have made their dreams come true by making their living in their backyard greenhouse and selling their produce to local restaurants and markets. The potential of hydroponic culture is incredible, but commercial hydroponics in the United States was held back until hydroponic systems that were economical to build and relatively easy to operate became available in the marketplace. This form of gardening is also easily adapted to indoor environments, which means it can be used throughout the year to grow a gardener’s favorite plants. The greatest advantage to hydroponics is the overall outcome of the plants, which will be of better quality and are much healthier. Gardeners can give nature a helping hand while enjoying the therapeutic benefits of their garden. A small greenhouse can cost considerably more because you will need to either include a cement floor and drainage system or lay other types of flooring such as gravel before you build the greenhouse itself. Many small greenhouses cost anywhere from $500 to over several thousand dollars, depending on the add-ons you choose.