Rose question

[BestIsWest]

A few years ago we had to dig up a beautiful red hybrid tea rose because the roots had got tangled with an invasive grass.
It’s now grown shoots from what I’m guessing is the original rootstock. They are growing like mad but is there any chance that they will ever flower?
What would maximise my chances of getting it to flower?

They are suckers from the rootstock, not the grafted variety that was on the top. Unless you have live stems growing from above the graft, then it's had it, sorry.

I realise it’s not the grafted rose. I’m asking if the suckers from the rootstock will bear flowers.

I've had a number of rootstocks grow and flower nicely. Single, white or pink roses. Very very big.

When you say big, how big? This is already 4feet tall.
.

6ft+.

Yes, the wild rose used for a graft will flower. It’s not usually a UK species. One of me rootstock roses looks like a dogrose but with decently pink flowers, not washed out. It would happily grow to 12ft but I keep it pruned to a 6ft fence. Other one is still a baby at 4ft and has pure white flowers.

They’re chosen for vigour so they’re not going to be small

Oh wonderful! It’s against an ugly breezeblock wall at the end of the garden so I’ll be glad of the growth! Until DH cuts it back (vows to hide secateurs from him).