Even though we live in Zone 4, in June of 2013 we purchased a Meyer Lemon and a Moro Blood Orange (and received a second Meyer and a Calamodin by mistake). They were all about 6-9 inches tall on arrival.

Due to climate, they can only be outdoors from late May to early October, but we put them by a south facing sliding glass door and supplemented with full spectrum CFLs. We feed weekly with Foliage Pro and white vinegar.

Here's what they look like on arrival and after one year:

Imgur Gallery

The Moro is in the same pot in both pictures so you can judge the sizes.