I've used the following plants from my backyard successfully in bouquets:
Daisies, Tansy leaves, Cattails, Cattail leaves, Alliums, Purple Aster in the late summer, Bee Balm/ Monarda/ Bergamot, Blazing Star (you can get 100 or 1000 roots for very cheap, like at Van Bourgondian, for example), Black-Eyed Susans.
(Note tansy leaves do have a medicinal smell, but they look very fern-like and you cannot kill the plants.)
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