Where can I get tall standing plants and flowers for cheap for a makeshift garden??

I need to create a "garden" scene in an office but do not want to overspend on supplies. Where can I get cheap or even free tall, big leaf plants and flowers for this?

Where can I get tall standing plants and flowers for cheap for a makeshift garden??
Sunflowers are huge and easy to grow from seeds.
Reply:You want a garden in an office? If you have a window, you can probably grow some live plants such as Pothos ivy, Cast Iron Plant (can't remember the latin name, grows big single leaf blades from each stem and can grow without sun), or cut-leaf philodendron. To get these plants, walk around your neighborhood and intorduce yourself to the little old ladies who have flowerpots full of all kinds of plants on their porches. Tell them what you are trying to do and offer to trade them help with chores for advice and some little plants and you will probably get more plants than you ever hoped for. Make sure you treat them with respect (the ladies and the plants).
Reply:You can try freetreesandplants.com. The plants are free but you have to pay shipping and handling. Its a nonprofit organization which employs handicapped individuals, so its also a good cause and may be tax deductable.
Reply:Hollyhocks grow from seeds and get tall. They need the sun, tho'.