I use Burgess. I've had to send back some bare root vines that didn't grow before, and they were replaced without any hassle.

I order from Brecks.  If you look around online, you can usually find a $25 off $50 coupon.

For bulbs I've generally used either John Scheepers or Van Engelen (they are affiliated, but one is more for large orders - can't recall which is which right now).  Garden Watchdog is useful for checking out companies. 

http://davesgarden.com/products/gwd/c/43/

Just search by the company name. 

(Are we answering the wrong question here?  Are you looking for fresh flowers?)

If you go to www.davesgarden.com you can see reviews of lots of places.  Brecks has pretty mixed reviews.  However the best part is people there will trade flowers just like we do here for books!  Several years ago I got a ton of hostas and lily of the Valley in exchange for things I had.  People also will send you a boxful for the cost of postage.

Wayside Gardens has gotten some so-so reviews but I ordered climbing roses from them last year and although they took forever to get to me (I was sure they'd be dead), it turned out to be a ood experience.  The plants are healthy and thriving.

I love Springhill Nursery.  They have a great policy if the plants you get are poopy- they replace them with no questions asked.  I know, because that happened once.  They have a beautiful catalog and website.  Their plants are top notch.  I love their double decker coneflowers.

spring hill nursery

I highly recommend Bluestone Perennials.  Their prices are great and I have never had a plant come to me in poor condition.  One thing, they are small plants.  I actually prefer that.   I like to put them in, give them the first season to really get their feet in the ground and then they explode the following year!    If you have a small plant budget (which I do) their prices can't be beat in my opinion.  You just have to know that you will be getting small plants and be patient.  Like I said, every one I got has exploded the following year. 

I've been pleased with Bluestone too.  Now one little issue there is that they often sell things in 3's and you may not need 3 Six Hills Giant Catmints, lol.  (I believe in planting what lives - well, I hope they made it but then there were 3!)

Another place that I liked is Hallson Gardens.  They specialize in hostas but I ordered a few other things from them last year when other places were out of them and they were great.  Here's their link : Hallsons

Oh - I am so thrilled that my named link worked out!

Okay, I am probably going to sound preachy here and I'm sure some people will have gotten some nice things that lives from places that aren't rated very well.  However, even if they have a money-back guarantee, they don't pay you for your time, effort and your disappointment.  Maybe their guarantee is just that they will replace it - okay, will they replace it with another crappy plant?  It can take months before you are sure something really isn't going to make it.

It's true that planting is always a gamble, but it's less of a gamble if you buy good plants to begin with.  It's up to the individual, and some expensive places don't send the best plants, but buying from the better growers doesn't usually mean the cheapest ones either. 

There are some well known vendors that used to be very good but aren't now because they have changed hands but kept the same name.  It pays to do a bit of research before you order.

My barberry was on sale at K-Mart, for instance.  I believe it was labeled as some kind of dwarf (probably crimson pygmy) - it's over 6' high and fortunately I like it very much.  Someone who had placed it somewhere that a 6-7' bush would be a problem would not have been as pleased.

I'm a member over at Dave's Garden and if you don't participate in anything else over there everyone who does mailorder gardening should use Garden Watchdog before sending their money and order to a company they aren't very familiar with  .    http://davesgarden.com/products/gwd

 I read the negative reviews because if I have a problem I can get an idea of how they will respond by someone else's experience. 

Alot of times the vendor will respond to the complainant directly from their ratings posts on the Garden Watchdog.  The good vendors value their ratings there. 

They also have a section towards the bottom of the page on the link "Who Owns What" with a parent/affiliated list of different garden related companies and who they are related to.   Helps you to avoid the duds.   It's sort of nice to go through the listings of all the companies using the alphabetical listings...I had no idea there were that many gardening/plant places.   When you click on a particular company, their ratings page and the feedback shows up and a link if they have a website available.   Pretty cool.

i have ordered from Jackson & Perkins the roses when they go on sale & been super pleased with them; they got purchased by Park Seed & will be now sending small plants apparently & not the bare root which i liked so am not sure how that will go. However, I keep watching Walmart & when they bring in the plants for spring I pounce! Gotten beautiful roses with nice canes for a fraction of the cost would have to pay J&P for; I also go to farmer's markets which we have many of where I live; Medford, Ashland, Jacksonville, all have at different days of the weeks & that is where I discovered pink lilies of the valleys 8 years ago which i had never even heard of b/4; they have a lot of great plants which I was unfamiliar with & I always go to the Master Gardener's fair every spring faithfully & find loads of plants I drool over & just because I am a gardener I suppose find them fascinating even tho I can't have them all; I just adore plants & trees & have found so many there & it is so nice to see them up close & personal & find out about so many I never even knew existed! I absolutely adore trees & have picked up one every single year! I love the acer's (maples); while I love the bamboo's the price is high & the risk great if they are runners but I love to see them every year! & tiny plants for rock gardens, red yes RED hydranga's! maybe everyone else knows of these but I sure didn't & love to find them & see them; the only nursery I have ever ordered from that I was totally unhappy with is Autumn Ridge; Springhill & Bluestone I was very happy with & also Wayside; I especially loved the fact that with J&P I could get specials & got 7 English roses for $42 & even with S&H was a fraction of the cost I could have gotten them for in Emmet Idaho when I was there; also their 2 for 1 Tree Roses with S&H was far cheaper than I could have gotten at the local nurseries! (they wanted $60!!!! at the nurseries for 1 tree rose!) I got 2 for $39 & S&H cheaper than 1 tree rose from local nursery!

To Mary S.

I was scrolling down the comments this morning and I noticed your (avatar?) with the cute little flashing purses.

I just love them !  Where do you get these ?

I'm picking up good garden infor. on places to order perennials too.

Helen L.