Gingko trees are beloved for their light green and lacy fan-shaped foliage and are commonly called the maidenhair tree for their large scale resemblance to maidenhair ferns. Gingko seeds should be started indoors in a moist environment, then allowed to harden off indoors before being planted as seedlings into the outdoor ground soil. Start a greater number of seeds than you want gingko trees to account for a percentage of seeds failing to germinate.
Germinate one up to five gingko seeds in a resealable plastic bag filled with 2 cups of very moist peat moss. Nestle the seeds into the top inch or 2 of peat moss and close the seal. To germinate greater numbers of seeds, simply repeat this set up with five seeds per bag.
Store the sealed bag indoors at room temperature for several weeks. Initial sprouts will appear as early as two weeks from planting but allow the other seeds to catch up. Refrain from placing the bag in direct sunlight because this can cook the seeds. Average ambient room light is sufficient.
Remove the seedlings from the plastic bag once they have each grown fine white roots and two to three small leaves. Pot up each seedling in a small 4-inch-diameter nursery pot filled with sterile potting soil. Place the pot in a sunny location indoors.
Mist the seedlings daily with tepid water to help bridge the transition from the greenhouse conditions of the plastic bag to the drier indoor air. Water once a week to keep the soil evenly moist at all times.
Allow the seedlings to grow indoors for several months and then transplant them into an outdoor ground location with full sun exposure when temperatures are mild and any threat of frost has passed.