"Guidance" is 3' on center (from the center of one to the center of the next), but it all really depends on the variety and growing habit of the plant. What are the varieties in the assortment, please? I'm assuming hybrid teas, which typically grow very upright, but it would help us to know.

Diane has it, 3 ft. on center. However, that can vary depending on the rose. Most HTs grow tall and narrow but not all of them. Floribundas usually are a little shorter and wider and shrubs can be all over the place for size. Knowing your roses helps a lot in determining placement. Even then they can surprise you. I had my front bed all laid out for size so the short ones would be in front and the taller ones in back. Ha! They grew all different than what I thought and I ended up having to do a Chinese fire drill and move them all around after I figured out how they wanted to grow,lol.

I usually research the size of the variety before I place it in the garden. The size varies so much depending on the variety, climate, soil type, rootstock, how much you water and fertilise, how hard you cut it back in winter etc. For example, I gave Frederic Mistral 10 x 10 ft space and he has used it all up because he is a well known large rose and I am in a hot climate and my roses are on fortuniana roots which are known to give vigor. Marie Pavie and Ebb Tide, however, only need 2-3 ft spacing as these are small rose bushes.

My ebb tide needs 2 or3 feet. My Champlain needs 5 ft and my viking queen is spread out 10 ft

When I went to the Huntington Gardens in CA, I noticed they planted their roses in the beds, closer together than I would have. I assume they will move the roses around as they grow. Fortunately roses don't mind being moved. I tried to plant mine for the long term in mind, but still ended up moving some once I saw how the roses are growing.

One big issue in spacing is ....where do you live? In my z4 area a rose like 'Knock Out' only grows about 2' x 2' but when I was visiting in Atlanta, GA, I saw 'KO' 6' t x 5' w. You really need to talk with rose gardeners in your area.

The questions about where you live and what kinds of roses you have do make a difference for the spacing. Most of the Brecks offerings are hybrid teas and floribundas, which as others have said tend to grow more upright and need less space between them, but they also sell some shrub roses that spread out more.

The other question to consider is what your gardening style is. The recommendation of an average of 3' between roses (more if it's a spreader, as Sam says) is to keep space between the roses, like a more formal rose garden. My goal is to have very little space between the roses that isn't filled by other perennials some day, so my plants are closer together and mingle freely in a good year. That builds a mishmosh of color and style, but I like that. I can get away with it because we have a relatively dry climate (most years) and I'm not as dependent on complete air circulation around the roses to cut down on blackspot. Folks on the East coast have to be more careful about rose spacing because of heavier blackspot issues. That's part of why people are asking about your general region too.

All in all, there aren't hard and fast rules of rose gardening, and if you find you've placed the roses farther apart than they need, that always leaves room for more roses (smile). Just remember that most roses won't grow into their full size for at least 3 years, and some roses (like climbers and teas) take longer than that.

Also remember to have fun and enjoy your roses!

Cynthia

Thanks, everyone for weighing in. From what you all are saying, I should leave everything along and not plan to add anything to the mix. The bed is a half moon shape on the east side of the 2 story part of my house. From right to left in the back: 1) Unamed rose which I dug up at my son's house. It was dug up last year and it has stayed really small, with just one shoot this year. It was a really tall, upright bush with canes that were a good 3/4" across, a monster when it was growing at his house. 2) Chrysler Imperial which is spaced 3' apart, 3) Unamed rose which was dug up at my son's house, 4) Unamed Rose which was dug up at my son's house, 5) Christian Dior, 6) Dark Desire. (back row is spaced 3' on center)

From right to left in the foreground: 1) Double Delight 2) Perfume Delight 3) Sundowner 4)All American Beauty. (front row is spaced about 5' apart).

Would love to see photographs when everything settles in.

From what you know about these roses, you seem to have the front row vs. back row as good as you can know, though Dark Desire is too new to know exactly how big it'll turn out to be in different zones. I'm planning on mine being relatively shorter. Chrysler Imperial and Christian Dior and the first unnamed monster sound fine in the back row. The foreground row definitely are smaller roses in my climate, but it depends on where you are how big they'll get for you. The only comment is that the taller roses in general tend to need more space than the shorter ones. I think the 3' in the back should be fine for the ones you can identify, since they tend to be relatively upright bushes. The 5' spacing in the front is probably more than you need for those smaller roses, but hey- you have to keep some space open for next year's roses! You might put some annuals in between the roses to fill in the space - I use things like the Salvia Victoria Blue since the purple color ties everything together, it blooms all season, and I yank it all out after the winter kills it. There are ample choices out there to fill in the visual space while you see what these roses do in YOUR yard.

Cynthia