When it comes to garden perennials, mixing colors are beautiful in your landscaping theme. When you combine purples with yellows and blue with reds, you have gardens that come alive with a robust color in the springtime.
Perennial choices that goes great together are the red and blue lobelia, yellow and purple iris and many of the daylilies accent one another well also.
Perennials are excellent because they reproduce and come back every year. Annuals have to be replanted every year and do not do as well as perennials.
Affordable gardening means planting perennials is much better than opting for annuals for a one-time bloomer.
For Shady spots, it's nice to put in groundcovers where little else will grow also. English Ivy and Vinca Minor both are excellent vine plants and both love shade. They can tolerate some sunlight, but they thrive in shady spots as well. Vinca Minor which is also called Periwinkle and Myrtle blooms in the early spring season with a delicate lavender bloom. These evergreen groundcovers stay green year long too. With Its many advantages, it's no wonder the Vinca Minor perennial vine is such a great seller.
Do you have a hillside or erosion of the soil on a steep bank? Groundcovers and vines, when planted in thick, dense cluster (1/2 foot apart), will stop the soil from eroding from the bank. They are also great for lower maintenance areas like the hillsides where it's a talk just to weed eat.They will grow in thick cluster prohibiting weeds and other small plants from coming up, so little maintenance is needed where you plant these vines close together.
Source of Information on Color Mixing for Beautiful Results in your Garden