You want to give your plant the best chance at growing and surviving. Planting at the right time of year is a key factor in this. Planting times will vary depending on the plant and where you live. Again, this will vary depending on where you live.  If you are not sure of the best time of year to plant your tree, consult your local University Extension Service or similar service. Each county in the United States has a University Extension Service and many countries, including India and Kenya, have them as well.  If you are in the United States, you can locate your local University Extension Service using the National Institute for Food and Agriculture’s interactive online map at http://nifa.usda.gov/partners-and-extension-map .

TL;DR in Vietnamese:
Lựa chọn đúng thời điểm trong năm để trồng cây. Thông thường bạn nên trồng cây khi cây trong thời kỳ ngủ đông hoặc khi cây không ra hoa trong mùa mát hoặc mùa lạnh của năm.