From Ground: First, water the maritime pine plant to dampen the soil, making extraction easier and less stressful for the plant. Using a shovel, dig around the plant ensuring not to disrupt the general area of the root system. Lift the maritime pine plant gently from its original location, taking care to preserve as much of the root system as possible.
From Pot: While wearing gardening gloves, invert the pot, allowing the plant and its roots to slide out with the soil. The best time to do this would be when the soil is relatively dry to avoid damaging the roots.
From Seedling Tray: Using a garden trowel, gently separate the maritime pine seedling from its fellow seedlings. Lift the seedling by its leaves, not by its stem or roots, and pull up very gently.