Climbers need 4'-5' between them. Roses need good drainage so add coarse sand to your soil amendments. Take some dirt and put it in a tall wide mouth bucket. Add water to make a slip-like consistency like with potter's clay. Cover the roots with this muddy solution and soak over night.
Straight water can be too harsh on the roots.
These are organic nutrients that will release slowly into the soil. Providing nutrients for your rose bushes. You can top dress existing bushes with the same amendments. Scratch into the soil and water. Use liquid seaweed or fish emulsion ever two weeks to enhance the quality and number of the blooms.