Most newbie gardeners can either purchase an easy to install grow room or build a greenhouse outside of their home. Small grow rooms for the beginning hydroponic gardener are usually slightly larger than a closet and can be completely installed in under an hour. The cost ranges from several hundred dollars to over $500, depending on the add-ons that you think you will need. Incorporating hydroponics into an outdoor garden can help add interest and intrigue. The natural conditions available outdoors in the summer make it a perfect time to experiment with the various types of hydroponic cultivation. Annual flowers, fruit, herbs, and vegetables do exceptionally well with hydroponics. Commercial crop growers are turning to soil less cultivation more and more. The speed of growth combined with the control over the growing environment means higher quality crops. The worry over soil born diseases and pests are greatly reduced, plus weeding is a thing of the past. For commercial growers, rapid harvest and higher yields are great reasons to grow hydroponically. Hydroponic growth leads to an increase in production over traditional farming in two ways. For one, hydroponic gardening just plain saves space. Plants can be placed much more closely together than in traditional fields; as many as four times as many plants can be grown in the space using hydroponic techniques as opposed to traditional methods. Specially formulated hydroponic fertilizer mixtures are required and should be tested after dilution to ensure a pH level of between five and six. This nutrient solution should be changed every two weeks and in between changes should be checked so the volume is kept level by adding more water only and not additional formula. The plant roots are suspended within the water by various designs and the crop obtains the food nutrients directly from the water, or from an air mist sprayed directly unto the plant roots. Hydroponics also requires the use growing media. Hydroponic systems use various mediums that are composed from relatively inert materials that have the ability to retain the food rich moisture and have the ability to physically support the plant roots.