From ground: First, water the blue cereus plant to dampen the soil. This will make the digging process easier and less stressful for the plant. Once the soil is softened, carefully shovel around the plant, ensuring not to cut into the root ball. Gradually work your shovel or garden fork under the plant, gently levering it up and out of the ground.
From pot: Begin by lightly watering the plant in its pot to reduce the stress during transplant. Turn the pot sideways, hold it gently and tap the rim on a firm surface like a potting bench, this should loosen the root ball and slide the plant out with minimum damage.
From a seedling tray: Lightly water the tray before starting the removal process since moist soil will cling to the roots better, thereby offering them better protection. Carefully slide a trowel beneath the seedling, lifting it with a lot of soil around the roots to protect them. Handle the seedling by the root ball and not by the stem.