Also, leave enough space between the pots to allow air to pass through. Or cover them with a sheer cloth in the afternoon. To avoid leaf scorch, put the seedlings under the sun in the morning and move them under the shade in the afternoon. Leaf scorch occurs when water is lost from the leaves more quickly than the roots can take it up. It often happens during the hot summer day when water is evaporated through leaves but the water absorption by the roots is less than it should be. Japanese maples are prone to leaf scorch. When the sunlight gets stronger in summer, avoid letting the Japanese maple seedlings get the late afternoon sun. Placing a seedling pot/tray directly on the ground is not desirable because the humidity from the ground prevents the pot/tray from draining water well and there may not be enough airflow. Keep in mind that seedlings need sunlight, moisture and carbon dioxide to create their energy through photosynthesis. Seedlings grow vigorously by exposing to sunlight and airflow as much as possible during the first period of growth. Japanese maple trees are photophilic (sun-loving) plants, which makes their seedlings growing indoors very difficult.
The Japanese maple seedlings thus should be placed in a sunny, well-drained and well-ventilated place outdoors, preferably on some kind of shelf. Each species have a certain range of temperatures at which they can grow soundly and 68☏ (20☌) is found to be ideal with some range on the upper side. Temperature influences most plant processes such as photosynthesis, transpiration, and respiration.
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