Hi Cinda,
 
As a photographer and artist who owned and ran my own gallery and art fairs for years, I have lots of experience in making and packaging unframed prints for sale.  So here are some questions for you before I could make a specific recommendation.
 
What price do you wish to sell these prints for?
What is the medium you are wishing to reproduce?  Photograph, graphic art, etc...
Where are you having these printed?
 
You can chat with me offline if you like and I can try to give you some solid guidelines so you'll get the most for your money.  Doreen@SalonOfArt.com

I agree, I would like to hear what Doreen suggests.  I do a lot of printing for my photographs.  

Oh Doreen, you are always so much help and I too did craft shows in a five state for a few years before buying into the floral shop.  I just never sold prints.
 
Now in my flower shop, I did buy a mat cutter and framed pictures but it was such a hard job for not much money.  This is why I just think I will market prints.  Also, Doreen, it is like the cards, probably will be hard to know which will sell and as you said before it may take time to find the niche.
 
Main question is what weight paper and is it important the type of paper?  I asked the printer to use at least 100 lb acid free and he said most all his paper is acid free.
 
I have worked with CMYK and my printer for the book had me change to I believe spot before sending the file in InDesign.  But this time, I am going to use a printer who has two very beautiful digital printers - it is just I am not sure he knows the rules.
 
The printing is very inexpensive but I will need to find the products to have my help do the shrink wrap.
 
I did send this link to the publisher this morning and it is the first of some prints  
 
http://www.floralshops.net/ideas/unframed_prints1.html
 
I will also sell wholesale as well as retail and really hope to reach the wholesale group first as you know it would be much easier.
 
Hope this does not get me into trouble posting about something that does not apply to the cards but since Tracey wanted to know too, I guess we can share.
 
Cinda

Yes, Cinda we appear to have an audience  
 
Okay, well let me see if I can address the paper issue first and have it make sense.  In the photographic/art world, when a 'collector' purchases a print they are doing so with the idea in mind that it will technically 'increase in value'.  That being said; ART prints should be printed with archival paper and archival ink (Giclee for example).  This provides the prints with a 75+ year life.  There are numerous paper to choose from, most of which are quite expensive which drives the price of the print up.
 
So, now that I've stated that, let's say you want to sell prints for the 'ordinary' person who simply wants wall decor, and wants it cheap.  Those who would just as soon buy there prints at WalMart if the print had the color and theme they desired.  If, that is the market you seek, then I would have your printer provide you with a sample print of a heavily saturated image of yours on three different papers.  A matte finish, a semi-gloss finish and gloss.  There are significant variations of white and florals need to 'pop', so I'm guessing you'll want to find a bright-white.  100-lb Acid Free sounds like a good choice for this type of printing.
 
Get SAMPLES of your work printed on this paper BEFORE running the order.  If he is a digital printer, he should now how to manipulate curves and hues to make minor adjustments and get your florals to print brilliantly.
 
I hate shrink wrap, so I'll tune back in with how I package prints.  Feel free to ask questions, and of course as always...this is just my opinion

Okay...more on the subject of paper and printing.
 
Let's talk expense and marketing so you can make an 'informed' decision about how you go about this.  I have a storeroom FULL of Giclee and home-made archival prints (archival paper AND archival ink) that have still not sold (of course I got tired of lugging them all over which is one of the reasons they remain unsold ).  
 
There is the cost of the print; let's say $5.00 for 11x14 on decent paper.  Now you have to factor in the expense of the matt board that goes behind the print to support it in the package (never use cardboard it's tacky).  Now add the cost to package it.  
 
I use clear-seal bags with come in every size and shape imaginable.  I think it's www.clearbags.com they are in Folsom, CA (near me) but have become one of the leading packaging companies for artists. I also use them for my cards.  The beauty of them are; affordability, classy presentation, and no ugly shrink wrap edges.
 
Now let me also state here, my prints were always signed and always limited edition, printed as Fine Art and therefore the cost of everything goes up and the average selling price was $50, so this is a bit different.
 
So, do you want to have a print inventory on-hand and sell them yourself, or can you have them printed on demand and shipped directly to your customer?

Sorry Doreen had to go to a meeting and then when I came home the electricity was out due to a storm.  Came back to town to work and respond.
 
First the printer will print as needed so this won't be a problem.  His machine only prints up to 18-14 so the sizes will need to be stirred down.  He only charges .88 per page and double for both sides on the 100 lb stock.  He doesn't charge anymore for semi (or at least that is what I understand).  
 
When he printed my first pages for the book, it was an actual nightmare.  I never could get the flowers to come out the correct color.  But that was over a year ago and he says he has learned more about his new machines.  I do believe him because I tested some covers and they appeared to look good on semi paper but this will be the first on matt.  I will remember about changing to the semi or high if it appears to be a problem.
 
Thank you for the source on the wrap and you may get a chuckle out of this but I used the foam core for everything imaginable including teaching girls how to make bows.  See my link here http://www.floralshops.net/ideas/bow.html  I did this almost ten years ago so it is very crude and the hands are my Mom's who is gone now.  Also it was great for window displays, etc.  I will need to find a cutter again.
 
Since the printer's machine will not print larger than 14x18 I think the poster prints may be out or at least I think they are larger than that to look good.
 
Again, thank you and I will reread to see if I missed anything.
 
Cinda
 

Hi Cinda, no problem I figured you were busy...I did expect you to have a life ya know  
 
Yup, good old foam core  The samples your printer does can be done on smaller sheets if he likes.
 
When I inquired about posters vs prints, the reason I asked was in reference to using other print houses as another thought.