From Ground: The ideal time to remove wild celery from the ground is in the early morning or late afternoon, when
temperatures are lower and less stressful for the plant. First, water it to ensure the soil is moist. This helps the roots hold together during the move. Then, use a trowel to delicately dig around outside the main group of leaves, ensuring you're far enough out to avoid damaging the roots. Once you've loosened the earth around it, carefully lift the plant and its root ball from the soil.
From Pot: Water wild celery and allow the water to drain completely. Then, tip the pot sideways and gently pull out the plant while supporting its base. If the plant is firmly root-bound, you might need to cut the pot.
From Seedling Tray: Water the tray and use a small tool, such as a spoon, to ease each wild celery seedling out from its cell, being careful not to damage the roots or leaves.