How often should I water my bonsai tree to ensure its optimal health and vibrant growth? Is there a specific guideline that can be followed to prevent overwatering, which could lead to root rot, or under-watering, which might result in wilting? Given the varied environmental conditions and the specific species of bonsai I may be cultivating, what factors should I consider when determining the appropriate frequency for watering? For instance, does the size of the pot, the type of soil, or even the season play a pivotal role in this decision? Additionally, how can I effectively gauge the moisture levels in the soil to make an informed decision about whether my bonsai tree is thirsty or adequately hydrated? Are there any visual cues or techniques that can assist in this evaluation? Furthermore, how do changes in temperature and humidity influence the watering schedule I should adhere to?