Going for similar plants arranged in large groups can make your landscape maintenance a lot easier in comparison to scattered plants of different varieties. Grouping similar plants will help you in easier water, light, herbicide and fertilizer administration as they will have similar needs. In addition make sure to keep your planting beds narrow so they are easily accessible.
Over and above all this, the most important thing to bear in mind is that a lot depends on how you actually go about planting your flora. Improper planting techniques can lead to poor growth of plants and even death in the later phases. All this will pile up your maintenance work double fold. So make sure to practice proper planting techniques.