Smith says he is making the offer to "brighten up" devastated areas of Cumbria and Lancashire. He said those hit by floods have his "every sympathy".
He said flower beds will be "decimated" and if councils want plants to get in touch.
He has 40,000 polyanthus and 20,000 pansies ready to be planted.
Smith is based in Warwickshire. Contact email@example.com.