Cottonwood Hibiscus in Perth.

Hi we have just planted a row of 9 Cottonwood Hibiscus across our back fence to screen out neighbours, therefore keen for them to grow big and tall and quick! Thing is they get minimal sunlight - few get mid morning sun - few get afternoon sun. Will this impact their growth height and is there any nutrients I can give them to compensate for lack of sunlight. Thanks 🌱