It is true that Gibberellic acid are the secret of all commercial rose growers in Holland?

Question

How to produce a good quality, extra large size of a hybrid tea roses even without using PGR?

Answer 1

Frankly, I don't know if all commercial rose growers use Gibberellic acid or not.  I know that you can grow some beautiful roses at home without using plant growth hormones.  Give them tender loving care, proper fertilization, right amount of water, etc and you will grow beautiful roses.  Forget about plant growth hormones.

Answer 2

Gibberellic acid is not very secret.

The secret of at least *some* commercial rose growers in Holland is that they're cheating on their wives. Fertilizing the wrong patch, so to speak.