Hi @balaji27,
It is fairly common for a rose to grow strongly without producing buds, and it usually points to a few simple things that can be corrected.
When a rose receives a lot of nitrogen, either from rich soil or frequent feeding, it tends to put its energy into tall green growth rather than flower production. Feeding every fifteen days is generous, so you may want to reduce the frequency or switch to a fertiliser with a higher ratio of potassium, since potassium encourages flowering. This Manutec 450ml Liquid Potash Plus would be suitable to encourage blooming.
Another reason a rose avoids producing buds is a lack of sunlight. Roses need at least six hours of direct sun each day for reliable blooming. If the plant is shaded for much of the day, it will continue growing but will postpone flower production. If sunlight is limited, moving the plant to a brighter position often makes a big difference.
Pruning also helps roses focus energy on strong flowering stems. If the plant has become tall and leggy, trimming it back to outward-facing buds will encourage branching and create more points that can form flowers. Even a light shaping prune can shift the plant from vertical growth to productive growth. Check out How To Prune Roses for some guidance.
Finally, make sure the plant is not stressed from issues like pests, poor drainage, or drying out between waterings. A rose that is struggling will prioritise survival rather than flowering. Check out How To Grow and Care for Roses for some further guidance.
Once you adjust feeding, improve the light, and tidy its shape, you should start seeing buds forming in the next growth cycle.
Let me know if you have any further questions.
Jacob
