We love nature and the beautiful randomness of it all. Landscape designers want to copy this look and they do this by using one simple trick. There is an old saying that even numbers are boring to the eye, and this is true for your outdoor designs. Designers alike will all tell you that odd numbers are the way to go when it comes to aesthetically pleasing the eye. 
“Planting in odd numbers creates a visual interest and dimension, preventing static or boring beds. Mimicking nature’s randomness is key for an authentic look,” says Diana Cox of the Gardening Talk.
“Planting in threes helps to create an impact and stops the plants getting lost. If you’re working with a large border you can increase this again and plant out in fives, sevens, or more,” says Hannah Bryce of Minnow & Wolf Flowers.
When it comes to planting trees, it is also best to plant in threes. To do this you want to vary colors and textures when planting. Plant different species or plant the same plant but different varieties. “Three purple plants, three silver, and three green make a vibrant combo. Remember to keep height in mind and think vertically, too. Using three tall spikes, three mid-height mounts, and three low-growing spreads creates an ultra-dimensional look,” explains Diana.
When planting trees you do not want to plant three in a straight boring line. This rookie error is easy to do, but professionals in the industry will all tell you it is to be avoided under any circumstances.
“Plants can be arranged in a cluster which looks more natural. Whatever looks more natural. Whatever you do, always stagger the plants and avoid straight lines. You want the plants to grow as they would in nature,” directs Hannah.
If you really want to get creative, put three inside three. Using trios of three is the perfect way to add some creativity. Take three planters and plant three different plants in each.
“Three tall plants surrounded by three medium and three short plants makes a lovely mixed garden border. Along with varying colors and textures, it’s one of the easiest ways to create a topnotch garden design,” says Diana.
