from ground: First, water longhorn steer's-head to dampen the soil. Then, dig a generous perimeter around the plant with a shovel or spade, being careful to keep the root ball intact. Pry the plant gently from the ground using the tools to ease it out without causing harm to the root system.
from pot: Start by watering the longhorn steer's-head to make the soil more pliable. Turn the pot sideways and gently tap to loosen the plant. Gradually ease the plant out by supporting the base of the stem and roots, avoiding any harsh pulling which could damage the plant.
from seedling tray: Carefully water the seedlings in the tray. Use a hand trowel or a similar tool to loosen the soil around the individual plant. Gently lift the seedling of longhorn steer's-head by the leaves, not the stem, as this could cause damage, and make sure you bring a good amount of soil with the roots.