Step 1 Look at the plant canes and leaves to determine whether you've got a rose bush or another type of plant. ... Step 2 Observe the structure of your rose bush once you've made a positive identification of a rose family member. … Step 3 Check the flower structure if the rose bush is blooming. ... Step 4 Measure the dimensions of the rose bush with a measuring tape. https://www.countrygardenroses.co.uk/shop/125-A-Z?letter=A