I planted a lemon seed and I got a "tiny" lemon tree. I have it in very little soil so it doesn't grow too big but (surprisingly) it is in the same minuscule state for like a year now. I wasn't really worried about it since it looked healthy enough. Last week I noticed that the leafs turned yellow.
More info:
- The soil is like 5cm deep
- The location is the Netherlands
- There is also some grass in the same pot