The best time for planting is in spring or fall. Plants need a little more attention in the summer. Follow planting instructions and anything you plant should be a success.
Trees and Shrubs - the best time to plant trees or shrubs is when they enter dormancy, when they drop their leaves, or in the spring. How to Plant a Tree
Evergreens - avoid planting when it is too hot or dry.
Perennials - spring is prime perennial planting season but summer and fall will work, the plants will just need a little extra TLC.
Intense heat is a major enemy to newly planted plants. Give them all a good watering when planting to provide enough moisture to help get them properly established. You may need to use water bags or an irrigation system to help them along.
The soil and air are cooler in the fall and sunlight is less intense which is less stressful for the plants, plus regular rainfall gives a good start to root growth. Plants do not form a lot of new leaves but they will already be well established by spring. They will be more vigorous and larger in size. These tips also apply to splitting perennials.
What to avoid: