sorry, don't know anything about Michigan but you obviously did a good job of starting it from the seed; i suck at that. I can tell you this- avocado trees take forever to produce when you plant them from seed (up to like 20 years) in FL. You have to be an extremely patient person. Many homes in sofla have established trees so my tree came with the house. I don't think I would plant an avocado from seed. My youngest mango tree I bought 5 yrs ago established (cost me like $150) and the mangos are not really good yet...