Tammy:

The word "limited" has little meaning unless accompanied by an estimate of the size of the planting in feet or inches.
Sometimes the word limited is applied to really tiny areas, that will barely support 2 or 3 berry plants. When space is truly tight, it is better to plant less stuff.

Most red raspberry varieties will spread by underground shoots, some very aggressively. If planted close to another berry type, they will move right in unless you control them by frequent digging. Some blackberry varieties will also spread underground, though the tall, trailing thornless types generally will not. Black raspberries tend to grow a large bush, with canes that bend down to the ground and often tiproot.

If you plant all of these berries in one bed, you will want to ensure they are separated from one another by at least 4 feet, and preferably 6. If not, they may grow together and you will end up with a big mess. It might be best to select just one of these berry types that you like the best, and plant just that for starters. There will always be opportunities to plant more.

If you post again, please indicate what specific varieties of berry you intend to plant, and, if possible, the source of your plants. It might make it easier for others to advise you, based on their own experiences.

Don Yellman, Great Falls, VA

The 3 types of caneberries you mention are different enough in appearance that if they end up growing in an overlapped manner, it won't matter because you can easily tell which fruit is which, or which cane to prune at pruning time.

The most practical consideration is that many black raspberry varieties are thorny or prickly, and if these canes mingle with the other types, you will be going "ouch" no matter what type of berry you are picking. Also, if your blackberry canes are vigorous, they could shade and overshadow the raspberries.

But what you want to do is certainly possible on one trellis/row, although a typical blackberry trellis is overkill for raspberries, but when space is limited, ideal methods may have to take a back seat!

Sorry for not givimg more details on the spot I am planning to plant these bushes . I have 75 to 80 feet to plant these bushes . the limited space is really in reference to the trellis they will be planted on, because my own physical handicap I cant construct a trellis myself . my friend will construct one for me as long or wide as it needs to be but he can only put one up. I already have a blackberry that has thorns and a caroline red raspberry but they both are on there own seperate fences and do quite well. the ones I have ordered are apache blackberry more carolines raspberry and blackhawk black rasberry my worry is that if I plant the raspberries all together that one plant may domanate and overgrow the other. I hope the more information I have given helps.
thanks so much for your responses

You have plenty of room to do all that; I did the same thing with just 30 feet of trellis. If your row is north-south, put the blackberries up north and if the row is east-west, it doesn't matter.

Thank you for the info, if you dont mind I have a few more questions. I am not sure if I should mix in manure with the soil before I plant these new bushes and also do you use miracle grow on your berry bushes I was told that you dont want to use any thing on them but water.
Tammy

Hi Tammy-
Brambles like rich organic, well-drained soil. But, by amending your soil like that, the concerns is that drainage issues will develop. For example, due to the differences in dirt, you could wind up making a basin in which water will sit. Bramble roots are right up near the surface... So, I would loosen up the soil for planting, and then add your organic amendments (manure or compost) on the surface. As for miracle grow, yeah, sometimes I toss a little of that as well. -Glenn

Thanks Glen
I feel more prepared now to plant these bushes when they get here. I dont feel like I am in over my head now, again thank you!
Tammy