The isolation of a greenhouse from the outside world is both a strength and a weakness of this method for growing plants. While it preserves the general climate, watering of the plants must be constantly monitored, as you cannot rely on rain or condensation of the morning cold to provide moisture to your plants. Protected from insects, the glass walls also prevent pollination of the plants, which is another factor that greenhouse users must take into consideration. Bees are often introduced to nullify this problem. Location is extremely important when considering building a greenhouse. Depending on where you live, the most ideal place for the greenhouse will be the portion of the land that receives the most sunlight over the course of the year. This will change depending on which hemisphere you live in, and the shadows cast by the surrounding structures. Greenhouses can be constructed separate to a house, or joined together – both have their advantages and disadvantages. Joined greenhouses require less construction material, as one side is connected to the house, and the house may be able to protect the greenhouse from harsh weather conditions if positioned correctly. Separate greenhouses, on the other hand receive more sunlight, and generally have the potential to be much larger than joined greenhouses. If gardening is your hobby, it will be useful to consider the benefits of a greenhouse to your endeavours. Greenhouses allow you to cultivate rare and exotic flora that would otherwise be unobtainable in the natural climate that you live in, as you can regulate the conditions of the growing area to match any climate in the world. They also allow you to more easily fit your hobby into your busy schedule, as they enable you to tend to your plants at any time during the day or night, as a result of constant warmth and light within the greenhouse. Ask any gardening fanatic and they will gladly assure you to the advantages of a greenhouse.