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One is because you now have a base for the flower arrangement and two; a criss cross of stems makes it easier for flower placement.
2) If you are making a small, low arrangement, slide in the flowers in a criss cross so that the stems are all around the inside of the vase. You should now have a vase with a ring of flowers on the out side and nothing but stems showing in the middle. (The more stems you have in the vase, the easier it will be to have flowers stay put!) The rows of flowers are going to be higher each time you get them in until you have a nice rounded arrangement.
3) If you are making a tall arrangement, then use a tall slim vase.
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