Wearing gloves to protect against possible sharp glass edges or glass breakage, press the root plug you formed in the previous step, through the opening of the glass ball as shown, taking care not to force the plug against the fragile glass. The roots usually go through best if you twist them slightly as you insert them, screwing them into the glass ball through the neck.
When your reach the leaves or stems, remove any broken bits, or pieces that stick out too far, and gently compress the stems and leaves into a bundle, with leaves pulled up if possible along the outside of the bundle, and continue twisting the entire plant gently into the glass ball.
Take great care not to force the plant and risk breaking the neck of the glass ball.
Allow the rooted plant to fall into the soil at the base of the ball. You will arrange and plant it in the next step.
For rooted cuttings, or cuttings with no roots, follow a similar process to get the leaves through the neck of the glass ball.