What material is used to fill in the top of the centerpiece, and ...

[mydiamond]

What material is used to fill in the top of the centerpiece, and how long are the
  pieces that are used?

 
  What will be an ideal response?

Question 2

How is floral foam (OASIS) used in the construction of centerpieces, and how is it
  prepared before it is used?

 
  What will be an ideal response?

[akemokai]

Answer to Question 1

Sprigs of variegated English holly are added to the top of the centerpiece; each one
should be 4 to 5 inches long and cover the top of the floral foam block.

Answer to Question 2

Floral foam (OASIS) is used as a base and to hold moisture for the greenery. Before
using, soak it in a pan of water until there are no longer any air bubbles coming out of
the floral foam. This ensures that it is thoroughly saturated. Greens are then inserted
into the foam as needed for the arrangement design

[mydiamond]

Thanks for the timely response, appreciate it

[amcvicar]

Excellent