It's best not to cut holly back hard, with the plant boffins at the Royal Horticultural Society (RHS) insisting that holly bushes 'require little or no pruning and in fact may be spoilt by harder ...

Vertical growth is best encouraged early, as a Nellie R. Stevens naturally reaches 20 feet tall and 12 to14 feet wide.

which will not grow back. Low-growing groundcover junipers seldom need pruning except to remove dead tips resulting from winter damage or to keep them from encroaching on other plants, sidewalks ...