Typically grown outdoors, these trees provide a dazzling display of color in the spring and fall, while providing a natural beauty in the winter months. These trees are typically considered delicate, requiring a certain style of care in order to properly endure. For example, like many other bonsai, the maple bonsai must be replanted once every year or two, dependent on the type of maple that you have. An important part of tending to bonsai trees is maintaining the pots in which they grow. There are many types of pots available, both glazed and unglazed, that are designed to accent the bonsai grown within them. The pots will be changed over the course of the bonsai's life, so growers will need to learn how best to select and change the pots. Wires should be placed at a 45 degree angle to the branch when wrapping, and the wires should be spaced evenly. Proper spacing and angles of the wires will allow the tree to modify its growing patter, and help in the design of your bonsai. There are some supplies that you will need when growing bonsai. In addition to the four basic bonsai supplies, there are many other tools that are used in the care of bonsai. While most beginners only work with the four basic bonsai supplies, advanced users will use wire pliers, and special concave clippers to help shape and grow their bonsai. As you become more skilled with your bonsai, you will find you need more of these bonsai supplies in order to get the style of bonsai you desire. The most common type of bamboo bonsai found in homes is the 'lucky' bamboo, which is believed to bring luck to their owners. This variety of bamboo is hardy, and can be grown indoors or outdoors, provided that the bamboo is protected against frost. Like most species of bamboo, the plant does not thrive well in places where frost occurs. As the trunks of the tree have a layered appearance from the aerial growth of roots, it is not uncommon that designers will use this characteristic of the plant as a fundamental part of the finished piece. The aerial root system, if properly controlled, can enhance the appearance of the bonsai without risk of spreading beyond the confines of its pot or causing root problems in the pot itself.