When no bush of the field was yet in the land and no small plant of the field had yet sprung up...
Genesis 2:5

Four possibilities:
1) The plants had been created in all their potential life, but that potential had not yet been realized because all the other parts were not in place.
2) Full grown plants were created in chapter 1, but no seeds had been created and sprouted from them yet.
3) The narrative returned briefly to day 3 and then fast forwards to day 6.
4) The plants and animals mentioned here are only domestic varieties because man working the ground is given as a requirement of their growth.

Option 4 seems most likely, but then why would there be "no bush of the field"? Maybe there were trees, but no smaller plants.