When sourcing Maple Bonsai (Acer palmatum or similar), you must prioritize botanical health and aesthetic maturity. Key specs include trunk diameter (nebari), which indicates age and stability, and branch ramification, which shows the quality of pruning. Ensure the root system is well-established within a high-quality, well-draining substrate like Akadama or organic compost mixes. For B2B buyers, verify that the trees have undergone professional styling and wiring to meet commercial ornamental standards.