|my roses have very small roses on tghe bush. was very lg last year|
|Small blooms on rose bushes are usually the result of stress. Usually causes are feeding too little, watering too little or not enough sunlight.
If you're using a good supply of compost in the early spring and late fall - you should be fine. A top up of fish emulsion after each bloom flush usually works to keep the strength up.
If the sunlight levels haven't decreased because of surrounding trees and bushes growing up - and if the the rose is getting a solid 6-8 hours of full sun a day - then you're fine. Any less and you should move it.
Watering - usually 2 inches a week should do it unless you're on a heavy clay soil - and then you'll have to adjust depending on the water content in your soil.
One other cause might be that the top of the rose has died. And the new growth is coming from below the rose graft. This means you're growing the root stock and not the desirable rose. You don't say what kind of rose you have so I don't know if it's a grafted rose or not (almost all roses except for shrub roses are grafted).
That sums up the reasons for small blooms on roses - and I hope that gives you some sense of what to look for.