Geraniums and Alyssum

• Geraniums, while very showy, are known to have a very strong odor which is not always that pleasant. They also grow upwards and do not tend to spread sideways in a pot, which can leave parts of the pot bare. Alyssum is a very good companion plant for a geranium. This plant features small white or pink blossoms which smell very sweet. It also spreads out and acts as a carpet underneath the geranium.
  
  

Marigolds and Petunias

• Marigolds are typically planted not only for their vibrant yellow or orange flowers, but also for their pest repellent properties. Unfortunately, their smell which repels insects can also be too strong for people. They also tend to grow upwards and do not spread, especially in a pot. Pairing this plant with a color coordinated petunia can solve these issues. For example, a dark purple spreading petunia placed around marigolds will provide a carpet of color underneath the plant and help mask the odor of the marigold without reducing its pest deterrent effectiveness.
  
  

Morning Glories and 4 O'Clocks

• Morning Glories are a spreading or vining plant and they feature delicate blossoms that are typically pastel in color. They like to bloom during the early morning hours and will typically close up towards the end of the day. Flowering 4 O'Clocks also feature coordinating pastel blooms but they open up at around 4:00 in the afternoon. By pairing these two together, gardeners can enjoy color all day long.
  
  

Begonias and Impatiens

• For gardeners needing to fill in shady areas, begonias and impatiens are very well suited for one another. Begonias have very showy leaves that are typically dark green to burgundy and the blossoms can range in color from red, to yellow, orange and pink. Impatiens have smaller similarly colored foliage and often come in bi-colors that coordinate well with begonias. New Guinea Impatiens are another shade loving hybrid that actually combined the two plants together, making it an ideal companion for a begonia.