You will need to condition the Narcissi before you start arranging into the topiary tree for at least 24 hours. 

Remove all of the foliage from the Narcissi and start arranging in your preferred hand. 

Once you are happy with the arrangement, secure with raffia in the middle and finish with a neat bow. 

At the base of the arrangement, secure again with anchor tape 12mm as shown in the video. 

Cut the stems to size across instead of at a 45-degree angle and insert into the floral foam applying a slight pressure. 

Cover your mechanics around the base of the arrangement with cushion moss. 

To bring the colour down to the base of the arrangement by adding a couple of stems of paperwhites into the floral foam.