<Li> Watering: Different species of tree have roots with different tolerances for soil moisture . Some species tolerate continual wetness, while others are prone to rotting if the soil remains wet for long periods . A standard bonsai practice is to grow trees in a soil mixture that drains rapidly, so that roots are not allowed to be wet for long . To compensate for the relatively low water retention of the bonsai soil, water is applied frequently . The tree absorbs sufficient moisture for its needs while the water is passing through the soil, then the soil dries enough to reduce the chance of rotting . It is the grower's responsibility to ensure that watering occurs frequently enough to satisfy the bonsai with high watering requirements, while not waterlogging trees that use little water or have roots prone to rotting . </Li> <Li> Soil volume: Giving a bonsai a relatively large soil volume encourages the growth of roots, then corresponding growth of the rest of the tree . With a large amount of soil, the tree trunk extends in length and increases in diameter, existing branches increase in size and new branches appear, and the foliage expands in volume . The grower can move an outdoor bonsai from a pot to a training box or to open ground to stimulate this sort of growth . Replacing the tree in a bonsai pot will slow or halt the tree's growth, and may lead to die - back if the volume of foliage is too great for the limited root system to support . Managing the tree's available soil volume allows the grower to manage the overall size of the bonsai, and to increase vigor and growth when new branches are required for a planned styling . </Li> <Li> Temperature: Bonsai roots in pots are exposed to much greater variation in temperature than tree roots deep in the soil . For bonsai from native species, local temperatures do not generally harm the tree . But for bonsai from warmer native climates, the grower can increase the likelihood of successful cultivation either by insulating the tree from local winter conditions, or by actively increasing the bonsai temperature during the cold season . For trees from climates slightly warmer than the local one, bonsai pots can be partially buried in the ground and can be covered with an insulating layer of mulch . For trees from significantly warmer climates, warmer temperatures can be maintained in a cold frame or greenhouse, so that a relatively tender tree is not exposed to temperatures lower than it can bear . This approach may also artificially extend the bonsai's growing season, affecting watering and fertilization schedules . </Li> <Li> Sunlight: Trees generally require a good deal of sun, and most bonsai need direct sunlight during the growing season to thrive . Some shade - tolerant species of bonsai cannot thrive with too much direct sunlight, however, and it is the grower's role to site the bonsai specimens to provide the correct lighting for each type . Most bonsai will be located in an area that gets several hours of direct daylight . Shade - tolerant bonsai can be placed behind barriers (walls, buildings), sited on shaded benches or stands, or shaded by netting to reduce the impact of direct sunlight . </Li>

When is the growing season for bonsai trees
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