Florists Love dog wood! If it is clean, free of leaves and bundled like mentioned before, any florist would love to buy it......
It is best to harvest and offer as early as possible to get a jump on outside wholesalers. You will get a better price from a florist but Floral wholsalers will also purchase your Stems.
pussy willows, forsythia, peach blossoms, quince blosoms, cherry, curly willow, grapevines, contorted filbert and red or yellow dogwood are all very desireable. as long as they are cut well before blooming out and before they get leaves.
also moss and pine cones---of all variety are purchased by florists, again if it clean and Spider free