Nelson, I have a few stubborn variants like Blk Ischia, Ruby 3, Moscatel Branco, Improved Celeste, Natalina, Gino, RdB and B.Violetta that's not growing at all for now. Hence I have moved them to partial shade & giving them light dosage of MG on every watering. The same happened last year to my Bat.Green and then it took off in August.