Try this question over at the professional landscaper forum. They would probably have a better idea than those of us who are growing vegetables and other items for farmers markets.

IÂve found that the best thing to do is contract your prospective buyers as early as possible to see if they would be interesting in a specific product. The nursery owner or landscaper will have a pretty good idea as to what he can sell. Also check to see how he prefers them to be sold, by the flat, by the cell, or in larger pots. He can always by them by the flat and repackages them if he is willing to do so.
If you have some plants that are big enough to sell take them to the nursery in person and say this is what I will have, there not ready yet but would you be interested.
While your there ask him if there is anything else he could use.

ItÂs just always best to check first before you grow a lot of something so youÂre not stuck with a lot of plants, which can be very frustrating.

If the first person you contact is not interested ask him if he knows of anyone else who may be, you could be surprised.

Sometimes growers like us end up becoming so excited about a certain variety or plant that we grow what we think others should want instead of growing what they actually want. I made this mistake again last year by growing a lot of Lipstick Peppers - which in my opinion is the best tasting sweet pepper around. However the grocery stores couldnÂt sell them and the restaurants had no use for them, so I got stuck with hundreds of peppers.

Good Luck with Your Venture:

Zach

Good point Zach - It's much easier to grow what sells, rather than trying to to sell what grows.

On the other hnad it is exciting to break ground (successfully) with a brand new product.