Thuja and yew hedges. The rejuvenation method, as described above, is not suitable for conifers, since they have very few dormant buds. Thujas and yews are an exception, since they respond well to sever cutting back. Old plants should be reduced by half, and lateral branches should be shortened by half or a third, so as to shape the hedge into a sloping form. Dead branches should be removed. The best time to rejuvenate conifers is summer, from the beginning of June to midsummer. You could also prune in the second half of summer to early winter, however, this period is less favorable. The rejuvenated plants should be looked after, fertilized, and watered in a prolonged dry spell.
The flower borders require constant attendance from early spring to late autumn. There are bulbs to be planted and replanted, or herbaceous perennials that require dividing every 2 to 5 years. Then there is fertilizing, mulching, watering, thinning, pruning, deadheading. Besides, many herbaceous flowering plants look good only for a certain period of time, while they are in bloom. After the flowers fade, they only sit there providing with greenery or go dormant until the next season.
Most deciduous shrubs get old over several years time and loose their vigour eventually. Having said that, if your have an overgrown deciduous hedge, it still can be brought back into shape. To begin the process, cut back all growth to about 15-30 cm above the ground just before plants break dormancy in spring, and after any danger of severe frosts has gone.