From Ground: Start by lightly watering the silverrod plant to soften the surrounding soil. Next, using a gardening spade, dig a wide circle around the base of the plant to ensure none of the roots are damaged while removing it from the ground. Once you have loosened the soil around the plant, carefully lift the plant and its root ball from the ground, taking care not to damage the plant or roots.
From a Pot: Using a trowel, gently work between the plant and the pot, trying to keep as much of the soil and root structure intact. Slowly tip the pot while holding onto the base of the silverrod plant. If the plant doesn't slide out easily, lightly tap the edge of the pot on the ground to loosen the soil and roots on the sides.
From a Seedling Tray: Lightly water the seedlings. Use a spoon or small trowel to scoop out the entire seedling plug, being careful not to damage the young roots. Hold on to the base of the silverrod seedling while removing it from the tray, in order to limit any damage to the plant.