Posted: 10/01/2015 at 12:51
Garden Centres tend to offer larger plant, in flower - you can see what you are getting but you pay the price for their nurturing. On the whole bigger plants are more likely to suffer root check after planting. They are also grown in a light compost and sometimes find it difficult to spread their roots out into your "real" garden soil. In specialist nurseries you get the advantage to talking to the person who has actually raised the plant and will know where it is likely to do well.
When you buy online you are usually getting plugs or small plants which settle into garden soil more happily. Also you are ready to offer TLC as you know they will have been a bit stressed while they travel to you.