One way to avoid this problem, is to plan out exactly where and how you will plant the perennial. For the best looking perennial garden, you want it to look natural not artificial. To do this, one of the things that you will want to do is make sure to plant the perennial in groups. Never just plant a perennial as a one off flower. If you just plant one of each, you run the risk of your garden looking as though you just planted them willy-nilly. Instead, plant the perennial in groups of at least three. Doing this will help to ensure that your garden has a natural feel and it can also help to impact your garden has on its viewers.
Another way to keep your garden from looking a bit off, is to plant the flowers in a way that appears natural. Don’t plant them in straight rows, but use a staggering method when planting. If there is one thing to be said about nature, it is that it can’t be contained within strict lines and rows. Nature is meant to be free, not regimented.
One last tip for a more natural perennial garden is to repeat the grouping throughout the garden. Don’t just keep specific plants all together in one are, but allow the different groups to flow through each other.