Using more greenery and less flowers saves you money.
Before to remove leaves from the base of the stem you are working with. Leaving the bottom leaves on creates a larger hole in the foam and will be more likely to come out.
Be sure to insert the stems as far into the foam as possible, allowing them to get more to "drink" and stay fresher, longer.
Step1
Soak your foam in water until it is completely saturated.
Step2
Add greenery to the foam (Sandy uses ferns, salal, and seeded eucalyptus) until you have a nice full green arrangement.
Step3
Insert flowers (aster and alstroemeria) into foam until you reach the desired look for your arrangement.